#weixin-tip {
    display: none;
    position: fixed;
    left: 0;
    top: 0;
    background: rgba(0,0,0,0.8);
    filter: alpha(opacity=80);
    width: 100%;
    height: 100%;
    z-index: 100;
}

    #weixin-tip p {
        text-align: center;
        margin-top: 10%;
        padding: 0 5%;
        position: relative;
    }

    #weixin-tip .close {
        color: #fff;
        padding: 5px;
        font: bold 20px/24px simsun;
        text-shadow: 0 1px 0 #ddd;
        position: absolute;
        top: 0;
        left: 5%;
    }