* {
    margin: 0;
    padding: 0;
    font-family: "微软雅黑";
}

body, html {
    height: 100%;
    background: #f2f2f2;
    overflow: hidden
}

#preview {
    display: block;
    margin: 0 auto;
    width: 640px;
    height: 100%;
    border: 1px solid #ddd;
}

.qrcode-container {
    height: 180px;
    width: 160px;
    border: 1px solid #e4e4e4;
    border-radius: 5px;
    margin-bottom: 20px;
    background-color: #fff;
    padding: 10px;
    text-align: center;
    position: fixed;
    left: 48%;
    top: 100px;
    margin-left: 388px;
}

.qrcode-container p {
    font-size: 14px;
    color: #666;
    line-height: 26px;
}

.qrcode-container .qrcode-image {
    height: 160px;
    width: 160px;
}

.qrcode-container canvas {
    height: 158px;
    width: 158px;
    border: 1px solid #ddd;
}

.back-container {
    width: 180px;
    height: 32px;
    border: 1px solid #e4e4e4;
    border-radius: 5px;
    margin-bottom: 20px;
    background-color: #fff;
    text-align: center;
    position: fixed;
    left: 48%;
    top: 310px;
    margin-left: 388px;
    line-height: 32px;
    font-size: 14px;
    color: #666;
    cursor: pointer;
    text-decoration: none;
}

.iframe {
    display: block;
    margin: 0 auto;
    width: 640px;
    height: 100%;
    border: 1px solid #ddd;
}