Reply To: Add to cart button CSS problem ( variable product )

Hello,

You can try to use the below code, paste it into the “Global Custom CSS” area in Theme Settings -> Custom CSS.

.product-grid-item .add-to-cart-loop {
    width: 100%;
}

.product-grid-item .custom-checkout-btn {
    width: 100%;
    margin: 0 !important;
}

Desktop: https://take.ms/vwR2uw
Mobile: https://take.ms/b2zkA

Kind Regards