css 渐变颜色

background: -webkit-linear-gradient(left, #2745a2 , #4ab5dd);

background: -o-linear-gradient(right, #2745a2, #4ab5dd);

background: -moz-linear-gradient(right, #2745a2, #4ab5dd);

background: linear-gradient(to right, #2745a2 , #4ab5dd);