fix highlight error

Author: ahmadassaf

assets/css/style.scss

@@ -35,7 +35,7 @@ a {
 
 .highlight .hll { background-color: #ffffcc !important}
 .highlight .c { color: #008000 !important}
-.highlight .err { border: 0 !important, background: none !important}
+.highlight .err { border: 0 !important; background: none !important}
 .highlight .k { color: #0000ff !important}
 .highlight .cm { color: #008000 !important}
 .highlight .cp { color: #0000ff !important}