<html><head> <title>Bootstrap Example</title> <meta charset="utf-8"> <meta name="viewport" content="width=device-width, initial-scale=1"> <link rel="stylesheet" href="https://apps.bdimg.com/libs/bootstrap/3.3.0/css/bootstrap.min.css"> <style> body { position: relative; } ul.nav-pills { top: 20px; position: fixed; } div.col-sm-9 div { height: 250px; font-size: 28px; } #section1 { color: #fff; background-color: #1E88E5; } #section2 { color: #fff; background-color: #673ab7; } #section3 { color: #fff; background-color: #ff9800; } #section41 { color: #fff; background-color: #00bcd4; }