.quantity {
    display: inline-flex;
    align-items: center;
}

.quantity .qty {
    text-align: center;
    width: 60px;
    height: 40px;
    border: 1px solid #ccc;
    margin: 0 5px;
    border-radius: 5px;
}

.qty-btn {
    background: #eee;
    border: 1px solid #ccc;
    width: 40px;
    height: 40px;
    font-size: 18px;
    cursor: pointer;
    border-radius: 5px;
    line-height: 1;
    transition: background 0.2s;
}

.qty-btn:hover {
    background: #ddd;
}