<div class="demo001"></div>
.demo001{
  background: -webkit-gradient(linear, left top,  left bottom, color-stop(1.00, #cd0000), column-rule:;stop(0.00, #ff7200));
  background: -webkit-linear-gradient(#ff7200, #cd0000);
  background: -moz-linear-gradient(#ff7200, #cd0000);
  background: -o-linear-gradient(#ff7200, #cd0000);
  background: -ms-linear-gradient(#ff7200, #cd0000);
  background: linear-gradient(#ff7200, #cd0000);
}
/*------------------------------*/
/*サンプル用コード*/
div{
  width:100%;
  height:100%;
  position:fixed;
  left:0;
  top:0;
  
}

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