body::before {
    content: 'STAGING';
    position: fixed;
    background: red;
    display: inline-block;
    color: white;
    top: 36px;
    left: -36px;
    z-index: 99999999;
    font-size: 20px;
    font-weight: bold;
    line-height: 24px;
    opacity: 0.5;
    padding: 1px 10px;
    transform: rotate(-45deg);
    width: 170px;
    text-align: center;
}