set content with minimum height

src/index.css

@@ -30,6 +30,10 @@ html {
     padding: 1.5rem;
     z-index: 1;
     width: 100%;
+    min-height: 100vh;
+    display: flex;
+    flex-direction: column;
+    justify-content: space-between;
 }
 
 a {