First version.

CSS/Style.css

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+@font-face {
+    font-family: "FSEX302";
+    src: url("../Assets/FSEX302.ttf") format("truetype");
+    font-style: normal;
+    font-weight: normal;
+}
+
+:root,
+:root[data-palette="CatppuccinMocha"] {
+    --Rosewater: #f5e0dc;
+    --Flamingo: #f2cdcd;
+    --Pink: #f5c2e7;
+    --Mauve: #cba6f7;
+    --Red: #f38ba8;
+    --Maroon: #eba0ac;
+    --Peach: #fab387;
+    --Yellow: #f9e2af;
+    --Green: #a6e3a1;
+    --Teal: #94e2d5;
+    --Sky: #89dceb;
+    --Sapphire: #74c7ec;
+    --Blue: #89b4fa;
+    --Lavender: #b4befe;
+
+    --Text: #cdd6f4;
+    --Subtext1: #bac2de;
+    --Subtext0: #a6adc8;
+    --Overlay2: #9399b2;
+    --Overlay1: #7f849c;
+    --Overlay0: #6c7086;
+    --Surface2: #585b70;
+    --Surface1: #45475a;
+    --Surface0: #313244;
+    --Base: #1e1e2e;
+    --Mantle: #181825;
+    --Crust: #11111b;
+}
+
+html {
+    font-family: "FSEX302";
+    color: var(--Text);
+
+    background-image: url("../Assets/Img/Tile.png");
+    background-repeat: repeat;
+}
+
+body {
+    margin: 0;
+    padding: 2rem;
+
+    font-family: inherit;
+    color: inherit;
+}
+
+* {
+    box-sizing: border-box;
+    font-family: inherit;
+}
+
+.MainContainer {
+    max-width: 800px;
+    margin: 0 auto;
+    padding: 2rem;
+
+    color: var(--Text);
+    background-color: var(--Base);
+
+    border: 4px solid var(--Mauve);
+}
+
+h1, h2, h3, h4, h5, h6 {
+    margin-top: 0;
+    margin-bottom: 1rem;
+
+    color: var(--Mauve);
+}
+
+h1 {
+    font-size: 2.5rem;
+
+    padding-bottom: 0.5rem;
+    border-bottom: 3px solid var(--Mauve);
+}
+
+h2 {
+    font-size: 2rem;
+    color: var(--Blue);
+}
+
+h3 {
+    font-size: 1.5rem;
+    color: var(--Green);
+}
+
+h4 {
+    font-size: 1.25rem;
+    color: var(--Peach);
+}
+
+h5 {
+    font-size: 1rem;
+    color: var(--Yellow);
+}
+
+h6 {
+    font-size: 0.9rem;
+    color: var(--Rosewater);
+}
+
+p {
+    margin-top: 0;
+    margin-bottom: 1rem;
+
+    color: var(--Text);
+
+    font-size: 1rem;
+    line-height: 1.5;
+}
+
+a {
+    color: var(--Blue);
+}
+
+a:hover {
+    color: var(--Sky);
+}
+
+strong {
+    color: var(--Peach);
+}
+
+em {
+    color: var(--Lavender);
+}
+
+ul, ol {
+    color: var(--Text);
+}
+
+li {
+    margin-bottom: 0.5rem;
+}
+
+blockquote {
+    margin-left: 0;
+    padding: 1rem;
+
+    color: var(--Subtext1);
+    background-color: var(--Mantle);
+
+    border-left: 4px solid var(--Mauve);
+}
+
+code {
+    padding: 0.2rem 0.4rem;
+
+    color: var(--Green);
+    background-color: var(--Mantle);
+}
+
+pre {
+    padding: 1rem;
+    overflow-x: auto;
+
+    color: var(--Text);
+    background-color: var(--Crust);
+
+    border: 2px solid var(--Surface2);
+}
+
+pre code {
+    padding: 0;
+    background-color: transparent;
+}
+
+hr {
+    border: 0;
+    border-top: 2px solid var(--Surface2);
+}
+
+input, button, textarea, select {
+    font-family: inherit;
+    color: inherit;
+}

HTML/Bits/Head.html

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+<head>
+    <meta charset="UTF-8">
+    <meta name="viewport" content="width=device-width, initial-scale=1.0">
+
+    <title>My Webpage</title>
+
+    <link rel="stylesheet" href="CSS/Style.css">
+</head>

HTML/Sarahtonin.html

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+<!DOCTYPE html>
+
+<html lang="en" data-palette="CatppuccinMocha">
+    <div include="./HTML/Bits/Head.html"></div>
+    <body>
+        <main class="MainContainer">
+            <h1>Welcome</h1>
+
+            <p>
+                Hi. There's nothing here yet, sorry.
+            </p>
+        </main>
+    </body>
+
+    <script src="./JS/Script.js"></script>
+</html>

JS/Script.js

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+function includeHTML() {
+  var z, i, elmnt, file, xhttp;
+
+  console.log("Including HTML.")
+
+  z = document.getElementsByTagName("*");
+  for (i = 0; i < z.length; i++) {
+    elmnt = z[i];
+
+    file = elmnt.getAttribute("include");
+    if (file) {
+      xhttp = new XMLHttpRequest();
+      xhttp.onreadystatechange = function() {
+        if (this.readyState == 4) {
+          if (this.status == 200) {elmnt.innerHTML = this.responseText;}
+          if (this.status == 404) {elmnt.innerHTML = "Page not found.";}
+          elmnt.removeAttribute("include");
+          includeHTML();
+        }
+      }
+      xhttp.open("GET", file, true);
+      xhttp.send();
+      return;
+    }
+  }
+}

index.html

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+<!DOCTYPE html>
+
+<html lang="en" data-palette="CatppuccinMocha">
+    <div include="./HTML/Bits/Head.html"></div>
+    <body>
+        <main class="MainContainer">
+            <h1>Welcome</h1>
+
+            <p>
+                You've arrived at Sarahtonin's homepage.
+                Feel free to browse around as much as you want.
+            </p>
+            <p>
+                If you want to access <strong>other links</strong>, you probably need to join my tailscale network.
+                <br>
+                Also, this is simply the homepage. You can use the <strong>navbar</strong> to the right to navigate around.
+            </p>
+            <p>
+                <b>
+                    Have fun snooping!
+                </b>
+            </p>
+
+            <h2>About Sarahtonin</h2>
+
+            <p>
+                I'm Sarahtonin. The creator of this very website.
+                It's a bit strange for me to write in first-person, I suppose. No matter, though.
+            </p>
+            <p>
+                I made this website because I'd prefer an easier way to share my socials,
+                and to just introduce myself in a better way.
+            </p>
+            <p>
+                Speaking of introducing myself, you should probably visit the <a href="HTML/Sarahtonin.html">page</a> about me.
+            </p>
+
+            <h3>Credits</h3>
+
+            <ul>
+                <li>
+                    The theme is
+                    <a href="https://catppuccin.com/palette/#flavor-mocha">Catppuccin-mocha</a>
+                    by
+                    <a href="https://catppuccin.com/community/">several people</a>.
+                </li>
+                <li>
+                    The font is
+                    <a href="https://github.com/kika/fixedsys">Fixedsys</a>
+                    by
+                    <a href="https://github.com/kika">Kirill Pertsev</a>.
+                </li>
+            </ul>
+        </main>
+    </body>
+
+    <script src="./JS/Script.js"></script>
+</html>