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<html><head><style>body { margin: 0;}* { box-sizing: border-box;} input, textarea { width: 100%;}</style></head><body><form action="/action_page.php"> First name:<br> <input type="text" name="firstname" value="Mickey"><br> Last name:<br> <input type="text" name="lastname" value="Mouse"><br> Comments:<br> <textarea name="message" rows="5" cols="30"> </textarea> <br><br> <input type="submit" value="Submit"></form> <p><strong>Tip:</strong> Try to remove the box-sizing property from the style element and look what happens.Notice that the width of input, textarea, and submit button will go outside of the screen.</p></body></html>