CodePen

HTML

            
              My sweet website.
            
          
!

↑ Insert the most common viewport meta tag

CSS

            
              body {
  background: red;
}
            
          
!
? ?
? ?
Must be a valid URL.
+ add another resource
via CSS Lint

JS

            
              
            
          
!
Must be a valid URL.
+ add another resource
via JS Hint
Loading ..................