diff --git a/data_visualization/css/base.css b/data_visualization/css/base.css
new file mode 100644
index 0000000..6dead44
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+++ b/data_visualization/css/base.css
@@ -0,0 +1,92 @@
+:root {
+  /* Farbvariablen */
+  --primary: #2b7a78;
+  --accent: #3aafa9;
+  --background: #f4f4f4;
+  --text-color: #222;
+  --muted-text: #555;
+
+  /* Typografie und Abstände */
+  --font-base: 'Arial', sans-serif;
+  --font-size-base: 16px;
+  --line-height-base: 1.5;
+  --spacing-xs: 0.25rem;
+  --spacing-sm: 0.5rem;
+  --spacing-md: 1rem;
+  --spacing-lg: 2rem;
+
+  /* Breakpoints */
+  --breakpoint-sm: 640px;
+  --breakpoint-md: 1024px;
+}
+
+/* === Base Reset and Variables === */
+html {
+  box-sizing: border-box;
+  font-size: var(--font-size-base);
+  scroll-behavior: smooth;
+}
+
+*, *::before, *::after {
+  box-sizing: inherit;
+  margin: 0;
+  padding: 0;
+}
+
+body {
+  margin: 0;
+  padding: 0;
+  font-family: var(--font-base);
+  line-height: var(--line-height-base);
+  color: var(--text-color);
+  background-color: var(--background);
+  -webkit-font-smoothing: antialiased;
+  -moz-osx-font-smoothing: grayscale;
+}
+
+/* === Typography and Layout Base === */
+h1, h2 {
+  color: var(--primary);
+  line-height: 1.2;
+}
+
+h1 {
+  font-size: 2rem;
+  margin-bottom: var(--spacing-md);
+}
+
+h2 {
+  font-size: 1.5rem;
+  margin-bottom: var(--spacing-sm);
+}
+
+p {
+  font-size: 1rem;
+  color: var(--muted-text);
+  margin-bottom: var(--spacing-md);
+}
+
+/* Grundlegendes Layout */
+body {
+  display: flex;
+  flex-direction: column;
+  min-height: 100vh;
+}
+
+main {
+  flex: 1;
+  padding: var(--spacing-md);
+}
+
+footer {
+  text-align: center;
+  font-size: 0.875rem;
+  color: var(--muted-text);
+  padding: var(--spacing-sm) 0;
+}
+
+footer::after {
+  content: "© 2026 Donau2Space.de";
+  display: block;
+  margin-top: var(--spacing-xs);
+}
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