Merge pull request 'FooterAnsEnde' (#9) from footerAnsEnde into dev

Reviewed-on: #9

css/footer.css

@@ -1,7 +1,5 @@
 /* Footer‑Grundlayout */
 footer {
-    position: fixed;
-    bottom: 0;
     width: 100%;
     background: #333d43;
     text-align: center;

css/main.css

@@ -3,12 +3,19 @@ main {
     max-width:1200px;
     margin: 0 auto;
     padding: 20px;
+
+    width: 100%;
+    box-sizing: border-box;
 }
 
 body {
     background-color: #eef2f7;
     color: #1f2937;
     margin: 0;
+
+    min-height: 100vh;
+    display: grid;
+    grid-template-rows: auto 1fr auto; /* Header(auto), Inhalt (bekommt Rest), Footer(auto) */
 }
 
 a, button, input, select, textarea, label, main{