Css样式-边框圆角/边框阴影/背景图片(background-image)显示颜色

.tooltip{
        background-color:#5c9bb7;
        background-image:-webkit-linear-gradient(top, #5c9bb7, #5392ad);
        background-image:-moz-linear-gradient(top, #5c9bb7, #5392ad);
        background-image:linear-gradient(top, #5c9bb7, #5392ad);
        box-shadow: 0 1px 1px #ccc;
        border-radius:3px;
        width: 290px;
        padding: 10px;
        position: absolute;
        left:50%;
        margin-left:-150px;
        top: 80px;
    }
    .tooltip:after{
        /* 提示信息 */
        content:'';
        position:absolute;
        border:6px s