diff --git a/_sass/libraries/hamburgers/_base.scss b/_sass/libraries/hamburgers/_base.scss
index 30ef6ba..c634994 100755
--- a/_sass/libraries/hamburgers/_base.scss
+++ b/_sass/libraries/hamburgers/_base.scss
@@ -21,9 +21,10 @@
   overflow: visible;
 
   &:hover {
-    @if $hamburger-hover-use-filter == true {
+    @if $hamburger-hover-use-filter ==true {
       filter: $hamburger-hover-filter;
     }
+
     @else {
       opacity: $hamburger-hover-opacity;
     }
@@ -31,9 +32,10 @@
 
   &.is-active {
     &:hover {
-      @if $hamburger-hover-use-filter == true {
+      @if $hamburger-hover-use-filter ==true {
         filter: $hamburger-active-hover-filter;
       }
+
       @else {
         opacity: $hamburger-active-hover-opacity;
       }
@@ -57,7 +59,7 @@
 .hamburger-inner {
   display: block;
   top: 50%;
-  margin-top: math.div($hamburger-layer-height, -2);
+  margin-top: $hamburger-layer-height / -2;
 
   &,
   &::before,
@@ -79,10 +81,10 @@
   }
 
   &::before {
-    top: ($hamburger-layer-spacing + $hamburger-layer-height) * -1;
+    top: -($hamburger-layer-spacing + $hamburger-layer-height);
   }
 
   &::after {
-    bottom: ($hamburger-layer-spacing + $hamburger-layer-height) * -1;
+    top: $hamburger-layer-spacing + $hamburger-layer-height;
   }
 }