background-image: -webkit-radial-gradient(top, circle cover, #ddd 0%, #eee 80%);
background-image: -moz-radial-gradient(top, circle cover, #ddd 0%, #eee 80%);
background-image: -o-radial-gradient(top, circle cover, #ddd 0%, #eee 80%);
background-image: radial-gradient(top, circle cover, #ddd 0%, #eee 80%);
background-repeat:no-repeat;

şöyle yazarsınız olur tekrarlanmasın...