fix: keep footer at the bottom of the page

styles.css

@@ -18,6 +18,9 @@
 }
 
 body {
+    min-height: 100vh;
+    display: flex;
+    flex-direction: column;
     background: var(--bg);
     color: var(--text-main);
     line-height: 1.6;
@@ -281,7 +284,7 @@ body {
 }
 
 footer {
-    margin-top: 24px;
+    margin-top: auto;
     background: #2b1b1b;
     color: #fff;
     text-align: center;