Update CSS for layout and styling adjustments

Added margin and padding reset to html and body. Ensured body has a minimum height of 100vh for proper layout.

Author: huangwtings-hub

Wireframe/style.css

@@ -7,14 +7,15 @@
 /* General page styling with flexbox for sticky footer */
 html, body {
   height: 100%;
+  margin: 0;
+  padding: 0;
 }
 
 body {
   font-family: Arial, sans-serif;
-  margin: 0;
-  padding: 0;
   display: flex;
   flex-direction: column;
+  min-height: 100vh;  /* ← ADD THIS: ensures body is at least full viewport height */
 }
 
 /* Make main content flexible to push footer down */