o yes ppg.

<!doctype>
<html>
   <head>
       <meta charset="utf-8" />
       <title>Radius</title>
       <style>
           body { background-color:rgba(0,0,0,0.8);}
           div.radius { border:solid 10px #000; border-left:solid 10px #fff; width:400px; height:400px; border-radius:50%; margin:200px auto; animation:runing 1.1s infinite ease-in-out; -webkit-animation:runing 1.1s infinite ease-in-out;}
           @keyframes runing{
               form{ transform:rotate(0deg)}
               to { transform:rotate(360deg)}
           }
           @-webkit-keyframes runing{
               form{ transform:rotate(0deg)}
               to { transform:rotate(360deg)}
           }
       </style>
   </head>
   <body>
       <div class="radius"></div>
   </body>
</html>