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HTML

            
              <h1>Rounded inside body border</h1>
            
          
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CSS

            
              * { box-sizing: border-box; }
html { height: 100%; }
body { min-height: 100%; }
body {

  border-color:red;
  border-width: 10px;
  border-style:solid;
  border-radius:60px;
  text-align: center;
  line-height: 2;
  box-shadow:red 0 0 100px 100px;
}
            
          
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JS

            
              
            
          
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