delete one line and add "&"

src/client/styles/scss/theme/_apply-colors.scss

@@ -7,8 +7,6 @@ $body-bg: $bgcolor-global;
 $body-color: $color-global;
 $link-color: $color-link;
 $link-hover-color: $color-link-hover;
-$link-hover-color-active: white;
-
 @import 'reboot-bootstrap-colors';
 @import 'reboot-bootstrap-theme-colors';
 

src/client/styles/scss/theme/_reboot-bootstrap-colors.scss

@@ -195,7 +195,7 @@ a {
   background-color: transparent; // Remove the gray background on active links in IE 10.
 
   @include hover() {
-    :not(.active) :not(.icon-fw) {
+    &:not(.active) :not(.icon-fw) {
       color: $link-hover-color;
       // text-decoration: $link-hover-decoration;
     }