.navbar-collapse {
    max-height:calc(100vh - 127px) !important;
}

@media screen and (max-width: 1670px) {
    .main_content {
        padding: 100px;
    }
}

@media screen and (max-width: 1040px) {
    .main_content {
        padding: 170px;
    }
}

@media screen and (max-width: 768px) {
    .main_content {
        padding: 0;
    }
}