body {
    font-family: 'Trebuchet MS', 'Lucida Sans Unicode', 'Lucida Grande', 'Lucida Sans', Arial, sans-serif;
}

.e404 {
    width: 80%;
    margin: 50px auto;
}

    .e404::after {
        content: "4 0 4";
        position: absolute;
        top: 0;
        right: 0;
        width: 360px;
        font-size: 400px;
        font-weight: bold;
        color: rgba(255, 216, 0, .5);
        margin: 100px auto;
        padding: 0;
        text-align: right;
        line-height: .75;
    }