.woocommerce div.product form.cart .button {
       background-color: #4a8420; 
    } 

.woocommerce div.product form.cart .button:hover {
       background-color: rgb(51, 91, 22); 
    } 

.woocommerce .wc-proceed-to-checkout .button:active {
       background-color: rgb(51, 91, 22); 
    } 

.woocommerce .wc-proceed-to-checkout .button {
       background-color: #4a8420!important; 
    } 

.woocommerce .wc-proceed-to-checkout .button:hover {
       background-color: #335b16; 
    }