Examples:
index.html
               <!doctype html>
               <html>
                  <head>
                     <meta name="viewport" content="width=device-width, initial-scale=1">
                     <link href="/assets/reset.css" rel="stylesheet">
                     <link href="setup.css" rel="stylesheet">
                     <link href="style.css" rel="stylesheet">
                  </head>
                  <body>
                     <section>
                        <p>This element is responsive.</p>
                        <p>I’ll add some text more here so we have something to look at and so that it wraps, but the text itself isn’t important, at the moment.</p>
                     </section>
                  </body>
               </html>
style.css
               body {
                  font-family: sans-serif;
                  padding: 20px;
               }

               p {
                  color: blue;
                  background: white;
               }