Move link transitions into however effects to avoid transition from browser default color.

assets/scss/style.scss

@@ -138,10 +138,10 @@ a {
   @include var(color, text-color);
   text-decoration: none;
   border-bottom: .2rem solid $primary-color;
-  transition: color 0.25s;
 
   &:hover {
     color: $primary-color;
+    transition: color 0.25s;
   }
 }