@media only screen and (max-width: 640px) { 
    #widget-override .simple-store .cart-status {
        display:none;
    }
    
    #widget-override .simple-store .simple-store-content .cart-view-container {
        margin:0;
    }
    
    #widget-override .simple-store .simple-store-content .button-row #cart-continue-button,
    #widget-override .simple-store .simple-store-content .button-row #cart-clear-button,
    #widget-override .simple-store .simple-store-content .button-row #cart-checkout-button,
    #widget-override .simple-store .simple-store-content .button-row #cart-update-button {
        float:none;
        width:90%;
        margin: 5px auto;
        display: block;
    }
}