@charset "utf-8"; body { position: relative; overflow-y: scroll; } ul.nav-pills { top: 20px; } div.col-sm-9 div { height: 250px; font-size: 28px; } .container { text-align: justify; height: 500px; } .container .row .col-md-3 { } .container .row .col-md-9 { overflow-y: scroll; height: 300px; } @media screen and (max-width: 810px) { #section1, #section2, #section3, #section41, #section42 { margin-left: 150px; } } ... ...