body {
    background-image: url('https://i.postimg.cc/fy2MnRKq/ts.png') !important;
    background-size: cover !important;
    background-position: center !important;
    background-attachment: fixed !important;
    background-repeat: no-repeat !important;
}

body::before {
    background: rgba(0,0,0,0.5) !important;
}