* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    background-image: url('https://t.alcy.cc/ycy');
    background-size: cover;
    background-position: center;
    background-repeat: no-repeat;
    color: #333;
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'PingFang SC', 'Microsoft YaHei', sans-serif;
    overflow: hidden;
    min-height: 100vh;
    display: flex;
    justify-content: center;
    align-items: center;
}

#c {
    display: block;
}