.watermark{
    display:flex;
    position:fixed;
    top:0;
    right:0;
    bottom:0;
    left:0;
    z-index:10052;
    user-select: none;
    pointer-events: none;
}
.watermark:after {
    content: '测试用';
    width:100%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 32vw;
    font-weight: bold;
    color: #b3b3b3;
    text-shadow: -4px 1px 5px #fbfbfb;
    opacity: .1;
    user-select: none;
    pointer-events: none;
}