Only use level 1 cleanCSS rules, because level 2 rules can break the css (#330)

Author: bartlangelaan

lib/gulp/css.js

@@ -108,7 +108,7 @@ function cssCompile({src, dest, cwd, browserSync = false}) {
         format: process.env.NODE_ENV === 'production' ? false : 'beautify',
 
         // Only enable safe rules.
-        level: 2
+        level: 1
       }));
 
       // Add sourcemaps when not building for production.

package-lock.json

@@ -4,4 +4,5 @@ body {
   background: red;
   appearance: none;
   font-size: 40px;
+  border: 100px solid hsl(96, 60%, 83%) !important;
 }