diff --git a/_includes/head.html b/_includes/head.html
index f8699c8..f7dc9fb 100644
--- a/_includes/head.html
+++ b/_includes/head.html
@@ -17,7 +17,7 @@
 
     <!-- tile icon & colour for Windows 8 -->
     <meta name="msapplication-TileImage" content="https://mgrove.uk/logo.png">
-    <meta name="msapplication-TileColor" content="#26174e">
+    <meta name="msapplication-TileColor" content="#c72a32">
 
     <!-- page info -->
     <title>{{ page.title }} | Matthew Grove</title>
diff --git a/_site/assets/css/main.css b/_site/assets/css/main.css
index 551db24..2dc53b7 100644
--- a/_site/assets/css/main.css
+++ b/_site/assets/css/main.css
@@ -2079,7 +2079,7 @@ ul.icons {
     opacity: 1; }
 
 /* CTA */
-#cta {
+.cta {
   color: rgba(255, 255, 255, 0.75);
   background-attachment: fixed;
   background-image: linear-gradient(135deg, rgba(var(--background-colour-dark-rgb), 0.5), rgba(var(--background-colour-dark-rgb), 0.9)), url(../../images/cta01.jpg);
@@ -2089,142 +2089,142 @@ ul.icons {
   position: relative;
   text-align: center;
   z-index: 1; }
-  #cta input, #cta select, #cta textarea {
+  .cta input, .cta select, .cta textarea {
     color: var(--button-text-colour); }
-  #cta a {
+  .cta a {
     color: var(--button-text-colour); }
-  #cta strong, #cta b {
+  .cta strong, .cta b {
     color: var(--button-text-colour); }
-  #cta h1, #cta h2, #cta h3, #cta h4, #cta h5, #cta h6 {
+  .cta h1, .cta h2, .cta h3, .cta h4, .cta h5, .cta h6 {
     color: var(--button-text-colour); }
-  #cta blockquote {
+  .cta blockquote {
     border-left-color: rgba(255, 255, 255, 0.25); }
-  #cta code {
+  .cta code {
     background: rgba(255, 255, 255, 0.075);
     border-color: rgba(255, 255, 255, 0.25); }
-  #cta hr {
+  .cta hr {
     border-bottom-color: rgba(255, 255, 255, 0.25); }
-  #cta input[type="submit"],
-  #cta input[type="reset"],
-  #cta input[type="button"],
-  #cta button,
-  #cta .button {
+  .cta input[type="submit"],
+  .cta input[type="reset"],
+  .cta input[type="button"],
+  .cta button,
+  .cta .button {
     background-color: transparent;
     box-shadow: inset 0 0 0 1px var(--button-text-colour);
     color: var(--button-text-colour) !important; }
-    #cta input[type="submit"]:hover,
-    #cta input[type="reset"]:hover,
-    #cta input[type="button"]:hover,
-    #cta button:hover,
-    #cta .button:hover {
+    .cta input[type="submit"]:hover,
+    .cta input[type="reset"]:hover,
+    .cta input[type="button"]:hover,
+    .cta button:hover,
+    .cta .button:hover {
       background-color: rgba(255, 255, 255, 0.1); }
-      #cta input[type="submit"]:hover:active,
-      #cta input[type="reset"]:hover:active,
-      #cta input[type="button"]:hover:active,
-      #cta button:hover:active,
-      #cta .button:hover:active {
+      .cta input[type="submit"]:hover:active,
+      .cta input[type="reset"]:hover:active,
+      .cta input[type="button"]:hover:active,
+      .cta button:hover:active,
+      .cta .button:hover:active {
         background-color: rgba(255, 255, 255, 0.25); }
-    #cta input[type="submit"].primary,
-    #cta input[type="reset"].primary,
-    #cta input[type="button"].primary,
-    #cta button.primary,
-    #cta .button.primary {
+    .cta input[type="submit"].primary,
+    .cta input[type="reset"].primary,
+    .cta input[type="button"].primary,
+    .cta button.primary,
+    .cta .button.primary {
       box-shadow: none;
       background-color: var(--button-text-colour);
       color: var(--secondary-colour) !important; }
-      #cta input[type="submit"].primary:hover,
-      #cta input[type="reset"].primary:hover,
-      #cta input[type="button"].primary:hover,
-      #cta button.primary:hover,
-      #cta .button.primary:hover {
+      .cta input[type="submit"].primary:hover,
+      .cta input[type="reset"].primary:hover,
+      .cta input[type="button"].primary:hover,
+      .cta button.primary:hover,
+      .cta .button.primary:hover {
         background-color: rgba(255, 255, 255, 0.875);
         box-shadow: none; }
-        #cta input[type="submit"].primary:hover:active,
-        #cta input[type="reset"].primary:hover:active,
-        #cta input[type="button"].primary:hover:active,
-        #cta button.primary:hover:active,
-        #cta .button.primary:hover:active {
+        .cta input[type="submit"].primary:hover:active,
+        .cta input[type="reset"].primary:hover:active,
+        .cta input[type="button"].primary:hover:active,
+        .cta button.primary:hover:active,
+        .cta .button.primary:hover:active {
           background-color: rgba(255, 255, 255, 0.5); }
-  #cta label {
+  .cta label {
     color: var(--button-text-colour); }
-  #cta input[type="text"],
-  #cta input[type="number"],
-  #cta input[type="password"],
-  #cta input[type="email"],
-  #cta input[type="tel"],
-  #cta input[type="search"],
-  #cta input[type="url"],
-  #cta select,
-  #cta textarea {
+  .cta input[type="text"],
+  .cta input[type="number"],
+  .cta input[type="password"],
+  .cta input[type="email"],
+  .cta input[type="tel"],
+  .cta input[type="search"],
+  .cta input[type="url"],
+  .cta select,
+  .cta textarea {
     background-color: rgba(255, 255, 255, 0.075);
     border-color: rgba(255, 255, 255, 0.25); }
-    #cta input[type="text"]:focus,
-    #cta input[type="number"]:focus,
-    #cta input[type="password"]:focus,
-    #cta input[type="email"]:focus,
-    #cta input[type="tel"]:focus,
-    #cta input[type="search"]:focus,
-    #cta input[type="url"]:focus,
-    #cta select:focus,
-    #cta textarea:focus {
+    .cta input[type="text"]:focus,
+    .cta input[type="number"]:focus,
+    .cta input[type="password"]:focus,
+    .cta input[type="email"]:focus,
+    .cta input[type="tel"]:focus,
+    .cta input[type="search"]:focus,
+    .cta input[type="url"]:focus,
+    .cta select:focus,
+    .cta textarea:focus {
       border-color: var(--button-text-colour);
       box-shadow: 0 0 0 1px var(--button-text-colour); }
-  #cta select {
+  .cta select {
     background-image: url("data:image/svg+xml;charset=utf8,%3Csvg xmlns='http://www.w3.org/2000/svg' width='40' height='40' preserveAspectRatio='none' viewBox='0 0 40 40'%3E%3Cpath d='M9.4,12.3l10.4,10.4l10.4-10.4c0.2-0.2,0.5-0.4,0.9-0.4c0.3,0,0.6,0.1,0.9,0.4l3.3,3.3c0.2,0.2,0.4,0.5,0.4,0.9 c0,0.4-0.1,0.6-0.4,0.9L20.7,31.9c-0.2,0.2-0.5,0.4-0.9,0.4c-0.3,0-0.6-0.1-0.9-0.4L4.3,17.3c-0.2-0.2-0.4-0.5-0.4-0.9 c0-0.4,0.1-0.6,0.4-0.9l3.3-3.3c0.2-0.2,0.5-0.4,0.9-0.4S9.1,12.1,9.4,12.3z' fill='rgba(255, 255, 255, 0.25)' /%3E%3C/svg%3E"); }
-    #cta select option {
+    .cta select option {
       color: rgba(255, 255, 255, 0.75);
       background-color: var(--secondary-colour); }
-  #cta input[type="checkbox"] + label,
-  #cta input[type="radio"] + label {
+  .cta input[type="checkbox"] + label,
+  .cta input[type="radio"] + label {
     color: rgba(255, 255, 255, 0.75); }
-    #cta input[type="checkbox"] + label:before,
-    #cta input[type="radio"] + label:before {
+    .cta input[type="checkbox"] + label:before,
+    .cta input[type="radio"] + label:before {
       background: rgba(255, 255, 255, 0.075);
       border-color: rgba(255, 255, 255, 0.25); }
-  #cta input[type="checkbox"]:checked + label:before,
-  #cta input[type="radio"]:checked + label:before {
+  .cta input[type="checkbox"]:checked + label:before,
+  .cta input[type="radio"]:checked + label:before {
     background-color: var(--button-text-colour);
     border-color: var(--button-text-colour);
     color: var(--secondary-colour); }
-  #cta input[type="checkbox"]:focus + label:before,
-  #cta input[type="radio"]:focus + label:before {
+  .cta input[type="checkbox"]:focus + label:before,
+  .cta input[type="radio"]:focus + label:before {
     border-color: var(--button-text-colour);
     box-shadow: 0 0 0 1px var(--button-text-colour); }
-  #cta ::-webkit-input-placeholder {
+  .cta ::-webkit-input-placeholder {
     color: rgba(255, 255, 255, 0.4) !important; }
-  #cta :-moz-placeholder {
+  .cta :-moz-placeholder {
     color: rgba(255, 255, 255, 0.4) !important; }
-  #cta ::-moz-placeholder {
+  .cta ::-moz-placeholder {
     color: rgba(255, 255, 255, 0.4) !important; }
-  #cta :-ms-input-placeholder {
+  .cta :-ms-input-placeholder {
     color: rgba(255, 255, 255, 0.4) !important; }
-  #cta ul.alt li {
+  .cta ul.alt li {
     border-top-color: rgba(255, 255, 255, 0.25); }
-  #cta table tbody tr {
+  .cta table tbody tr {
     border-color: rgba(255, 255, 255, 0.25); }
-    #cta table tbody tr:nth-child(2n + 1) {
+    .cta table tbody tr:nth-child(2n + 1) {
       background-color: rgba(255, 255, 255, 0.075); }
-  #cta table th {
+  .cta table th {
     color: var(--button-text-colour); }
-  #cta table thead {
+  .cta table thead {
     border-bottom-color: rgba(255, 255, 255, 0.25); }
-  #cta table tfoot {
+  .cta table tfoot {
     border-top-color: rgba(255, 255, 255, 0.25); }
-  #cta table.alt tbody tr td {
+  .cta table.alt tbody tr td {
     border-color: rgba(255, 255, 255, 0.25); }
-  #cta .highlights .content {
+  .cta .highlights .content {
     background: var(--secondary-colour);
     box-shadow: 0px 0px 4px 1px rgba(255, 255, 255, 0.025); }
-  #cta .testimonials .content {
+  .cta .testimonials .content {
     background: var(--secondary-colour);
     box-shadow: 0px 0px 4px 1px rgba(255, 255, 255, 0.025); }
-    #cta .testimonials .content .credit strong {
+    .cta .testimonials .content .credit strong {
       color: var(--secondary-colour); }
-  #cta .inner {
+  .cta .inner {
     position: relative;
     z-index: 3; }
   @media screen and (max-width: 980px) {
-    #cta {
+    .cta {
       background-attachment: scroll; } }
 
 /* Footer */
diff --git a/_site/comsci/index.html b/_site/comsci/index.html
index 596a495..e75635b 100644
--- a/_site/comsci/index.html
+++ b/_site/comsci/index.html
@@ -20,11 +20,11 @@
 
     <!-- tile icon & colour for Windows 8 -->
     <meta name="msapplication-TileImage" content="https://mgrove.uk/logo.png">
-    <meta name="msapplication-TileColor" content="#26174e">
+    <meta name="msapplication-TileColor" content="#c72a32">
 
     <!-- page info -->
     <title>Computer Science | Matthew Grove</title>
-    <meta name="description" content="Some helpful tips for studying Computer Science. | by Matthew Grove">
+    <meta name="description" content="Some helpful tips for studying Computer Science.">
     <meta name="keywords" content="" />
 
     <!-- stylesheets -->
@@ -36,7 +36,7 @@
         window.dataLayer = window.dataLayer || [];
         function gtag() { dataLayer.push(arguments); }
         gtag('js', new Date());
-        gtag('config', 'UA-124505000-1');
+        gtag('config', 'UA-124505000-2');
     </script>
 </head>
 
diff --git a/_site/index.html b/_site/index.html
index f809a5b..1478efe 100644
--- a/_site/index.html
+++ b/_site/index.html
@@ -20,11 +20,11 @@
 
     <!-- tile icon & colour for Windows 8 -->
     <meta name="msapplication-TileImage" content="https://mgrove.uk/logo.png">
-    <meta name="msapplication-TileColor" content="#26174e">
+    <meta name="msapplication-TileColor" content="#c72a32">
 
     <!-- page info -->
     <title>Demo Site | Matthew Grove</title>
-    <meta name="description" content="My demo site - where I host small coding projects and demonstrations. | by Matthew Grove">
+    <meta name="description" content="My demo site - where I host small coding projects and demonstrations.">
     <meta name="keywords" content="" />
 
     <!-- stylesheets -->
@@ -36,7 +36,7 @@
         window.dataLayer = window.dataLayer || [];
         function gtag() { dataLayer.push(arguments); }
         gtag('js', new Date());
-        gtag('config', 'UA-124505000-1');
+        gtag('config', 'UA-124505000-2');
     </script>
 </head>
 
diff --git a/_site/luhn-algorithm/index.html b/_site/luhn-algorithm/index.html
index b0ee59e..ce47797 100644
--- a/_site/luhn-algorithm/index.html
+++ b/_site/luhn-algorithm/index.html
@@ -20,11 +20,11 @@
 
     <!-- tile icon & colour for Windows 8 -->
     <meta name="msapplication-TileImage" content="https://mgrove.uk/logo.png">
-    <meta name="msapplication-TileColor" content="#26174e">
+    <meta name="msapplication-TileColor" content="#c72a32">
 
     <!-- page info -->
     <title>Luhn Algorithm | Matthew Grove</title>
-    <meta name="description" content="A number validator with the Luhn algorithm. | by Matthew Grove">
+    <meta name="description" content="A number validator with the Luhn algorithm.">
     <meta name="keywords" content="" />
 
     <!-- stylesheets -->
@@ -36,7 +36,7 @@
         window.dataLayer = window.dataLayer || [];
         function gtag() { dataLayer.push(arguments); }
         gtag('js', new Date());
-        gtag('config', 'UA-124505000-1');
+        gtag('config', 'UA-124505000-2');
     </script>
 </head>
 
diff --git a/_site/site-theme/index.html b/_site/site-theme/index.html
index 4f7a2d9..b10a389 100644
--- a/_site/site-theme/index.html
+++ b/_site/site-theme/index.html
@@ -20,11 +20,11 @@
 
     <!-- tile icon & colour for Windows 8 -->
     <meta name="msapplication-TileImage" content="https://mgrove.uk/logo.png">
-    <meta name="msapplication-TileColor" content="#26174e">
+    <meta name="msapplication-TileColor" content="#c72a32">
 
     <!-- page info -->
     <title>Site Theme | Matthew Grove</title>
-    <meta name="description" content="A list of all templated elements available in this site's theme. | by Matthew Grove">
+    <meta name="description" content="A list of all templated elements available in this site's theme.">
     <meta name="keywords" content="" />
 
     <!-- stylesheets -->
@@ -36,7 +36,7 @@
         window.dataLayer = window.dataLayer || [];
         function gtag() { dataLayer.push(arguments); }
         gtag('js', new Date());
-        gtag('config', 'UA-124505000-1');
+        gtag('config', 'UA-124505000-2');
     </script>
 </head>
 
@@ -531,7 +531,7 @@ print 'It took ' + i + ' iterations to sort the deck.';
 </div>
 
 <!-- CTA -->
-<section id="cta" class="wrapper">
+<section class="cta wrapper">
 	<div class="inner">
 		<h2>Example Fancy Header</h2>
 		<p>Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut aliquip ex ea commodo consequat. Duis aute irure dolor in reprehenderit in voluptate velit esse cillum dolore eu fugiat nulla pariatur. Excepteur sint occaecat cupidatat non proident, sunt in culpa qui officia deserunt mollit anim id est laborum.</p>
diff --git a/_site/sitemap.xml b/_site/sitemap.xml
index 66d928a..b03cb89 100644
--- a/_site/sitemap.xml
+++ b/_site/sitemap.xml
@@ -1,47 +1,56 @@
 <?xml version="1.0" encoding="URF-8"?>
 <urlset xmlns="http://www.sitemaps.org/schemas/sitemap/0.9">
     
+    
+    
     <url>
         <loc>/luhn-algorithm/</loc>
-        <lastmod>2020-12-13</lastmod>
+        <lastmod>2020-12-25</lastmod>
         <changefreq>daily</changefreq>
         <priority>0.5</priority>
     </url>
     
+    
+    
+    
     <url>
         <loc>/site-theme/</loc>
-        <lastmod>2020-12-13</lastmod>
+        <lastmod>2020-12-25</lastmod>
         <changefreq>daily</changefreq>
         <priority>0.5</priority>
     </url>
     
+    
+    
+    
     <url>
         <loc>/young-reporter/</loc>
-        <lastmod>2020-12-13</lastmod>
+        <lastmod>2020-12-25</lastmod>
         <changefreq>daily</changefreq>
         <priority>0.5</priority>
     </url>
     
+    
+    
+    
     <url>
         <loc>/</loc>
-        <lastmod>2020-12-13</lastmod>
+        <lastmod>2020-12-25</lastmod>
         <changefreq>daily</changefreq>
         <priority>0.5</priority>
     </url>
     
+    
+    
+    
     <url>
         <loc>/comsci/</loc>
-        <lastmod>2020-12-13</lastmod>
+        <lastmod>2020-12-25</lastmod>
         <changefreq>daily</changefreq>
         <priority>0.5</priority>
     </url>
     
-    <url>
-        <loc>/sitemap.xml</loc>
-        <lastmod>2020-12-13</lastmod>
-        <changefreq>daily</changefreq>
-        <priority>0.5</priority>
-    </url>
+    
     
     
     
diff --git a/_site/young-reporter/index.html b/_site/young-reporter/index.html
index e3b6761..b210363 100644
--- a/_site/young-reporter/index.html
+++ b/_site/young-reporter/index.html
@@ -20,11 +20,11 @@
 
     <!-- tile icon & colour for Windows 8 -->
     <meta name="msapplication-TileImage" content="https://mgrove.uk/logo.png">
-    <meta name="msapplication-TileColor" content="#26174e">
+    <meta name="msapplication-TileColor" content="#c72a32">
 
     <!-- page info -->
     <title>BBC Young Reporter Article Generator | Matthew Grove</title>
-    <meta name="description" content="A tool to create markdown files from news articles and their metadata for uploading to the Reading School BBC Young Reporter website. | by Matthew Grove">
+    <meta name="description" content="A tool to create markdown files from news articles and their metadata for uploading to the Reading School BBC Young Reporter website.">
     <meta name="keywords" content="" />
 
     <!-- stylesheets -->
@@ -36,7 +36,7 @@
         window.dataLayer = window.dataLayer || [];
         function gtag() { dataLayer.push(arguments); }
         gtag('js', new Date());
-        gtag('config', 'UA-124505000-1');
+        gtag('config', 'UA-124505000-2');
     </script>
 </head>
 
@@ -105,7 +105,22 @@
 	<section id="main" class="wrapper">
 		<div class="inner">
 			<div class="content">
-				<h3 id="instructions">Instructions</h3>
+				<h3 id="prerequisites">Prerequisites</h3>
+
+<p>Before you begin, ensure you have, as a minimum:</p>
+<ul>
+  <li>a headline,</li>
+  <li>the name(s) of the author(s),</li>
+  <li>a header image, which will be shown behind the headline (so the content of this image can’t be vital, like a graph),</li>
+  <li>a caption for your header image,</li>
+  <li>the copyright attribution for your header image,</li>
+  <li>a brief description (one or two short sentences) of your article, and</li>
+  <li>your article content.</li>
+</ul>
+
+<hr />
+
+<h3 id="instructions">Instructions</h3>
 
 <p>Fill in the fields below, and then click the <em>download</em> button to generate a file to be uploaded to Reading School’s BBC Young Reporter website.</p>