fix: remove empty lines in default CSS (vuejs#373)

Author: cexbrayat

template/base/src/assets/main.css

@@ -4,7 +4,6 @@
   max-width: 1280px;
   margin: 0 auto;
   padding: 2rem;
-
   font-weight: normal;
 }
 
@@ -14,7 +13,6 @@ a,
   color: hsla(160, 100%, 37%, 1);
   transition: 0.4s;
   padding: 3px;
-
 }
 
 @media (hover: hover) {