.cart-btn {
    width: 45px;
    height: 45px;
    background: red;
    border: none;
    border-radius: 8px;
    color: white;
    font-size: 28px;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: 0.2s;
}

    .cart-btn:hover {
        background: #cc0000;
    }