#i{ 



	 width: 200px; 



	 height: 134px; 



	 /*绘制线性渐变*/ 



	 /*background: linear-gradient(to right,#2f2f2f,black);*/ 



	 /*background: linear-gradient(to bottom,orange 0%,red 25%,yellow 50%,green 75%);*/ 



	 /*放射性渐变*/ 



	 /*background-image: radial-gradient(red,black);*/ 



	 /*background-image: radial-gradient(circle,red,black);*/ 



	 /*background-image: radial-gradient(circle at center top,red,black);*/ 



	 /*衣坐标形式*/ 



	 /*background-image: radial-gradient( at 130px 23px,red,black);*/ 



	 /*可渐变到离渐变起始点最近的一条边*/ 



	 /*background-image: radial-gradient( ellipse closest-side at 130px 23px,red,black);*/ 



	 background-image: radial-gradient( circle 130px at 130px 50px,orange 0%,red 35%,yellow,green 75%,black); 



	 position: absolute; 



	 margin: auto; 



	 left: 0; 



	 right: 0; 



	 bottom: 0; 



	 top: 1; 



	 }