Exemple:
</head>
<body style="
background: radial-gradient(center , circle
cover , rgb(215, 218, 210) 35% , rgb(206, 255, 250) 72%);
background:
-o-radial-gradient(center , circle cover , rgb(215, 218, 210) 35% ,
rgb(206, 255, 250) 72%);
background: -ms-radial-gradient(center ,
circle cover , rgb(215, 218, 210) 35% , rgb(206, 255, 250) 72%);
background: -moz-radial-gradient(center , circle cover , rgb(215, 218,
210) 35% , rgb(206, 255, 250) 72%);
background:
-webkit-radial-gradient(center , circle cover , rgb(215, 218, 210) 35% ,
rgb(206, 255, 250) 72%);
background-attachment: fixed;">