.watermark {
    position: absolute;
    z-index: 1;
    top: 42%;
    width: 100%;
    left: 0;
}

    .watermark img {
        width: 100%;
        background-size: 100%;
    }
    .watermark1 {
    position: absolute;
    z-index: 1;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    width: 100%;
    text-align: center;
}
.watermark1 img {
    max-width:100%;
}