body {
        background: #000;
        font-family: "Helvetica Neue", Helvetica, Arial, sans-serif;
    }
    
    a:hover,
    a:focus {
        text-decoration: none;
    }
    
    .block-center {
        width: 600px;
        height: 400px;
        position: absolute;
        left: 0;
        top: 0;
        right: 0;
        bottom: 0;
        margin: auto;
    }
    
    .image-logo img {
        margin: 0 auto;
        display: block;
    }
    
    .choose {
        position: absolute;
        bottom: 0;
        width: 100%;
    }
    
    .choose-item-box {
        width: 50%;
        float: left;
    }
    
    .choose .choose-item-box:nth-child(1) {
        position: relative;
    }
    
    .choose .choose-item-box:nth-child(1) a:before {
        content: '';
        display: inline-block;
        width: 4px;
        height: 60px;
        background: #fff;
        position: absolute;
        left: 100%;
    }
    
    .choose-item {
        font-size: 60px;
    }
    
    .choose .choose-item-box:nth-child(1) .choose-item {
        text-align: left;
        padding-left: 10%;
    }
    
    .choose .choose-item-box:nth-child(2) .choose-item {
        text-align: right;
        padding-right: 10%;
    }
    
    .choose-item a {
        color: #fff;
        text-decoration: none;
    }
    
    .choose-item a:hover {
        color: #33ffdd;
        text-shadow: 0px 0px 20px rgba(51, 255, 222, 1);
    }
    
    .copyright {
        color: #fff;
        font-size: 16px;
        text-align: center;
        position: absolute;
        bottom: 3%;
        left: 50%;
        width: 1300px;
        margin-left: -650px;
    }
    
    @media screen and (max-width: 1440px) {
        .image-logo img {
            width: 55%;
            height: auto;
        }
        .choose-item {
            font-size: 45px;
        }
        .choose .choose-item-box:nth-child(1) .choose-item,
        .choose .choose-item-box:nth-child(2) .choose-item {
            text-align: center;
        }
        .choose .choose-item-box:nth-child(1) a:before {
            width: 3px;
            height: 40px;
            margin-top: 2%;
        }
        .copyright {
            width: 1000px;
            margin-left: -500px;
            font-size: 12px;
        }
    }
    
    @media screen and (max-width: 768px) {
        .copyright {
            width: 90%;
            margin-left: 0;
            left: 5%;
        }
    }
    
    @media screen and (max-width: 640px) {
        .block-center {
            width: 85%;
        }
        .choose-item {
            font-size: 30px;
        }
        .choose .choose-item-box:nth-child(1) a:before {
            height: 30px;
        }
    }
    
    @media screen and (max-width: 480px) {
        .block-center {
            height: 250px;
        }
    }
    
    @media screen and (max-width: 414px) {
        .image-logo img {
            width: 65%;
            height: auto;
        }
    }
    
    @media screen and (max-width: 320px) {
        .choose-item {
            font-size: 25px;
        }
        .choose .choose-item-box:nth-child(1) a:before {
            height: 25px;
        }
    }