boostrap原理.html

<!DOCTYPE html>
<html>
    <head>
        <meta charset="UTF-8">
        <title></title>
        <meta name="viewport" content="width=device-width,initial-scale=1,minimum-scale=1,maximum-scale=1,user-scalable=no" />
    </head>
    <body>
        <div class="container bg-danger" >
            
        </div>
        
        <style type="text/css">
            .bg-danger{
                background: pink;
            }
            
            .container{
                width: 100%;
                margin: 0 auto;
            }
            
            
            @media only screen and (min-width: 576px) {
                .container{
                    max-width: 540px;
                }
            }
            
            @media only screen and (min-width: 768px) {
                .container{
                    max-width: 720px;
                }
            }
            
            @media only screen and (min-width: 992px) {
                .container{
                    max-width: 960px;
                }
            }
            
            @media only screen and (min-width: 1200px) {
                .container{
                    max-width: 1140px;
                }
            }
        </style>
    </body>
</html>