CC aplicado

css/style.scss

@@ -8,6 +8,7 @@ $outline-color: #ffa300 !default;
 html {
   box-sizing: border-box;
   height: 100%;
+  overflow: hidden;
 }
 *,
 *::before,
@@ -25,6 +26,7 @@ body {
   font-family: 'Arial', sans-serif;
   line-height: 1.3;
   font-size: 18px;
+  overflow: hidden;
 
   > header,
   > footer {
@@ -428,7 +430,7 @@ $transition-time: 0.3s !default;
 }
 
 #coursenav-main-content {
-  height: 100%;
+  height: calc(100% - 85px);
   overflow-x: hidden;
 }
 .stepper {