diff --git a/src/themes/theme.css b/src/themes/theme.css
new file mode 100644
index 0000000..35739c0
--- /dev/null
+++ b/src/themes/theme.css
@@ -0,0 +1,89 @@
+@font-face {
+  font-family: "ProggyClean";
+  src: url(https://witchcraft.systems/ProggyCleanNerdFont-Regular.ttf);
+}
+
+:root {
+  --link-color: #646cff;
+  --link-hover-color: #535bf2;
+  --background-color: #12082b;
+  --header-background-color: #1f1145;
+  --content-background-color: #0d0620;
+  --text-color: white;
+  --border-color: #8054f0;
+  --indicator-inactive-color: #4a4a4a;
+  --indicator-active-color: #8054f0;
+}
+
+
+::-webkit-scrollbar {
+  width: 0px;
+  background: transparent;
+  padding: 0;
+  margin: 0;
+}
+::-webkit-scrollbar-thumb {
+  background: transparent;
+  border-radius: 0;
+}
+::-webkit-scrollbar-track {
+  background: transparent;
+  border-radius: 0;
+}
+::-webkit-scrollbar-corner {
+  background: transparent;
+  border-radius: 0;
+}
+::-webkit-scrollbar-button {
+  background: transparent;
+  border-radius: 0;
+}
+* {
+  scrollbar-width: none;
+  scrollbar-color: transparent transparent;
+  -ms-overflow-style: none; /* IE and Edge */
+  -webkit-overflow-scrolling: touch;
+  -webkit-scrollbar: none; /* Safari */
+}
+
+a {
+  font-weight: 500;
+  color: var(--link-color);
+  text-decoration: inherit;
+}
+a:hover {
+  color: var(--link-hover-color);
+  text-decoration: underline;
+}
+
+body {
+  margin: 0;
+  display: flex;
+  place-items: center;
+  min-width: 320px;
+  min-height: 100vh;
+  background-color: var(--background-color);
+  font-family: "ProggyClean", monospace;
+  font-size: 24px;
+  color: var(--text-color);
+  border-color: var(--border-color);
+  overflow-wrap: break-word;
+  word-wrap: normal;
+  word-break: break-word;
+  hyphens: none;
+}
+
+h1 {
+  font-size: 3.2em;
+  line-height: 1.1;
+}
+
+#app {
+  max-width: 1400px;
+  width: 100%;
+  margin: 0;
+  padding: 0;
+  margin-left: auto;
+  margin-right: auto;
+  text-align: center;
+}
diff --git a/theming.ts b/theming.ts
new file mode 100644
index 0000000..60117fd
--- /dev/null
+++ b/theming.ts
@@ -0,0 +1,30 @@
+import { Plugin } from 'vite';
+import { Config } from './config';
+// Replaces app.css with the contents of the file specified in the
+// config file.
+
+export const themePlugin = (): Plugin => {
+    const themeFile = Config.THEME;
+    console.log(`Using theme file: ${themeFile}`);
+    return {
+        name: 'theme-generator',
+        transform(code, id) {
+            if (id.endsWith('app.css')) {
+                // Read the theme file and replace the contents of app.css with it
+                // Needs full path to the file
+                const themeCode = Deno.readTextFileSync(Deno.cwd() + '/src/themes/' + themeFile);
+                // Replace the contents of app.css with the theme code
+
+                // and add a comment at the top
+                const themeComment = `/* Generated from ${themeFile} */\n`;
+                const themeCodeWithComment = themeComment + themeCode;
+                // Return the theme code as the new contents of app.css
+                return {
+                    code: themeCodeWithComment,
+                    map: null,
+                };
+            }
+            return null;
+        }
+    };
+};
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