background: -webkit-radial-gradient(60% 55%, closest-side,blue,green,yellow,black);
background: -o-radial-gradient(60% 55%, closest-side,blue,green,yellow,black);
background: -moz-radial-gradient(60% 55%, closest-side,blue,green,yellow,black);
background: radial-gradient(60% 55%, closest-side,blue,green,yellow,black);
background: -webkit-radial-gradient(60% 55%, farthest-side,blue,green,yellow,black);
background: -o-radial-gradient(60% 55%, farthest-side,blue,green,yellow,black);
background: -moz-radial-gradient(60% 55%, farthest-side,blue,green,yellow,black);
background: radial-gradient(60% 55%, farthest-side,blue,green,yellow,black);