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HTML 
<section></section>
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<section></section>
 
 
    JavaScript 
    var elem = document.body.querySelectorAll('section')[0];
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    var elem = document.body.querySelectorAll('section')[0];
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    elem.className = "elem asd";
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    alert(elem.className);
     
     
      CSS 
          width:200px;
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      section{
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          width:200px;
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          height:200px;
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          background:#ed0000;
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          -webkit-border-radius:10px;
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          -moz-border-radius:5px;
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          border-radius:2px;
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      }
       
       
        Result