body {
            background: url('/bg.gif') repeat center center fixed;
            background-color: black;
            background-size: 100%;
            font-family: Arial, sans-serif;
            margin: 0;
            padding-top: 35px
        }
        .content {
            display: flex;
            justify-content: center;
            align-items: center;
            height: calc(100vh - 60px);
        }
        iframe {
            width: 100%;
            height: 100%;
            border: none;
        }