.watermark {
    height: 80%;
    width: 100%;
    background-image: url('/Images/logo.png');
    background-size: contain;
    background-repeat:no-repeat;
    background-position:center;
    position: fixed;
    left: 0;
    bottom: 0;
    margin-top: 30px;
    opacity: 0.1;
    z-index: -1;
}