.main-portfolio,
.certificates,
.portfolio,
.doors,
.catalogue,
.div-contact{
    box-shadow: 0px 20px 10px rgb(0, 0, 0, 0.1);
    border-top: 20px solid #dee3e8;
    border-radius: 5px;
    margin-top: 50px;
    margin-bottom: 50px;
}