.box-cart-head {
    position: relative;
    text-align: center;
}
.box-cart-head a {
    display: flex;
    align-items: center;
    justify-content: center;
}
.num-item-cart {
    position: absolute;
    top: -5px;
    right: -12px;
    background-color: #ddd;
    border-radius: 50%;
    width: 15px;
    height: 15px;
    font-size: 10px;
}