changes

css/altstyle.css

@@ -1,4 +1,8 @@
-body {
+html, body {
+    height: 100%;
+    width: 100%;
+    padding: 0;
+    margin: 0;
     background-color: gray;
     color: white;
 }

css/footerstyle.css

@@ -1,7 +1,6 @@
 .Footer-box {
     background-color: #38444d;
-    width: 103%;
-    margin-left: -1%;
+    width: 100%;
     margin-bottom: -1%;
     display: flex;
     justify-content: center;

css/mainstyle.css

@@ -1,4 +1,8 @@
-body {
+html, body {
+  width: 100%;
+  height: 100%;
+  margin: 0;
+  padding: 0;
   background-color: rgba(70, 72, 167, 0.5);
   font-family: Arial, Helvetica, sans-serif;
 }

css/menustyle.css

@@ -20,10 +20,11 @@
   }
   
   .Menu {
-    margin-left: -1%;
     margin-top: -1%;
     padding: 2%;
-    width: 103%;
+    padding-left: 0;
+    padding-right: 0;
+    width: 100%;
     list-style-type: none;
     overflow: hidden;
     background-color: #38444d;