@media only screen and (min-device-width: 768px) and (max-device-width: 1924px) and (-webkit-min-device-pixel-ratio: 2) {
    .default-btn  {
        padding-bottom: 0px !important;
    }
}

@media only screen and (min-device-width: 320px)  and (-webkit-min-device-pixel-ratio: 2) {
    .welcome-submit-row .default-btn  {
        padding-bottom: 0px !important;
        background: red !important;
    }
}