.designed-with-dpdp {
    position: fixed;
    left: 0;
    bottom: 0;
    width: 90px;
    height: 90px;
    z-index: 999;
    background-image: url(designed-with-dpdp.png);
    background-size: contain;
    background-position: center;
    background-repeat: no-repeat;
    filter: drop-shadow(4px 4px 5px rgba(0,0,0,0.2));
}