html,
body {
    margin: 0;
    padding: 0;
}

#wechat {
    width: 100%;
    height: 100%;
    background-color: #9E9E9E;
    display: none;
}

img {
    width: 100%;
    display: none;
}

.head {
    text-align: center;
    margin-top: 50px;
}

.foot {
    position: fixed;
    bottom: 0;
    left: 0;
    right: 0;
    text-align: center;
    font-size: 12px;
}