<!doctype html> <html lang="en"> <head> <meta charset="utf-8"> <meta name="viewport" content="width=device-width, initial-scale=1"> <link rel="shortcut icon" href="%PUBLIC_URL%/favicon.ico"> <title>React App</title> <style> .CodeMirror, .ReactCodeMirror { height: 100% !important; } .CodeMirror { border: solid 1px #d8d8d8; margin-bottom: 8px; } html, body, #root { height: 100%; } #root { display: flex; flex-flow: column; } </style> </head> <body> <div id="root"></div> </body> </html>