Fix experimental color in light mode

Author: rmosolgo

guides/css/main.scss

@@ -9,7 +9,7 @@ $brand-color-light:  #ed8090;
 $brand-color-extralight:  #f9e8ee;
 $dark-theme-brand-color-extralight:  #262324;
 
-$experimental-color: #fff7cf;
+$experimental-color: #91812f;
 $experimental-background: hsla(50, 100%, 32%, 0.15);
 
 $pro-color: #406db5;