.omedym-button  {
    height: 32px;
    line-height: 32px;
    width: 32px;
    background: url('../images/logo-without-text.png');
    padding: 0 !important;
}
.omedym-button:hover {
    background: url('../images/logo-without-text.png');
    opacity: 0.8;
}