fix header height

scss/_globals.scss

@@ -14,20 +14,6 @@ html {
   background: $black;
 }
 
-@mixin nav-height() {
-  height: 80px;
-  @media all and (max-width: $breakpoint) {
-    height: 75px;
-  }
-}
-
-@mixin margin-nav-height() {
-  margin-top: 80px;
-  @media all and (max-width: $breakpoint) {
-    margin-top: 75px;
-  }
-}
-
 @mixin button($color, $bg-color) {
   cursor: pointer;
   display: flex;

scss/index.scss

@@ -26,8 +26,8 @@ section {
 }
 
 nav {
-  @include nav-height();
   position: fixed;
+  height: 80px;
   width: 100%;
   z-index: 100;
   padding: 1rem 4rem;