.theme a.add_to_cart_button,
.theme a.product_type_external, 
.theme .form-submit input,
.theme .entry-summary form .single_add_to_cart_button {
    background-color: #FFB500 !important; 
    color: #000 !important;
    border-radius: 25px !important;
    box-shadow: 0 0 0 rgba(0,0,0,0) !important;
    transition: box-shadow .3s ease, transform .2s ease !important;
    float: right;
}

.theme a.add_to_cart_button:hover,
.theme a.product_type_external:hover {
    background-color: #FFB500 !important;
    color: #000 !important;
    box-shadow: 0 0 18px rgba(0,0,0,0.4) !important;
}

.theme a.product_type_external.loading,  /* Maybe delete if not necessary*/
.theme a.add_to_cart_button.loading {
    opacity: 1 !important;
}

.theme a.added_to_cart.wc-forward {
    display: none !important;
}