.product-extended-description {
    margin-top: 20px;
    
max-width: 1740px;
    padding: 20px;
    
        width: 100%;
    margin-left: auto;
    margin-right: auto;border:1px solid #f2f2f2;
    background:#fcfcfc;
}
.product-extended-description h3{font-size:16px!important;}
.product-extended-description h2 {
    margin-bottom: 10px;
    font-size: 1.5em;
}