.img-about {
    max-width: 900px;
    width: 100%;
    height: auto;
    display: block;
}
.img-khuyenmai
{
    max-width: 1200px;
    width: 100%;
    height: auto;
    display: block;
}
.product-img {
    height: 80px;
    width: auto;
    object-fit: contain;
    display: block;
    margin: 0 auto;
}

.title-item-diagram {
    color: #ffffff;
    background-color: #0071bb;
    font-size: 25px;
    font-weight: bold;
    text-align: center;
    margin: 20px 0;
    border: 1px solid #000;
    border-radius: 10px;
    padding: 15px;
}