#add_to_cart{

    background:linear-gradient(135deg,#2563EB,#3B82F6)!important;

    color:#fff!important;

    border:none!important;

    border-radius:12px!important;

    box-shadow:
        0 8px 20px rgba(37,99,235,.25),
        inset 0 1px 0 rgba(255,255,255,.15);

    transition:.25s;

}

#add_to_cart:hover{

    background:linear-gradient(135deg,#1D4ED8,#2563EB)!important;

    transform:translateY(-2px);

}