CSS库吧

background-image: -ms-radial-gradient(center bottom, ellipse closest-corner, #4B8BEE 0%, #78AAF6 100%);
background-image: -moz-radial-gradient(center bottom, ellipse closest-corner, #4B8BEE 0%, #78AAF6 100%);
background-image: -o-radial-gradient(center bottom, ellipse closest-corner, #4B8BEE 0%, #7BACFC 100%);
background-image: -webkit-gradient(radial, center bottom, 0, center bottom, 480, color-stop(0, #4B8BEE), color-stop(1, #78AAF6));
background-image: -webkit-radial-gradient(center bottom, ellipse closest-corner, #4B8BEE 0%, #78AAF6 100%);
background-image: radial-gradient(center bottom, ellipse closest-corner, #4A8BEE 0%, #78AAF6 100%);

demo 地址，请用 chrome 浏览
mark下