html, body {
    margin: 0;
    padding: 0;
    width: 100%;
    height: 100%;
}

body {
    background: #1A1A1D url("lh.jpg") center / cover no-repeat;
    width: 100vw;
    height: 100vh;
    overflow: hidden;
    display: flex;
    justify-content: center;
    align-items: center;
}