if the text is more, than height increase, but fixed width


if the text less , then it has no change
Exported from Notepad++
<html><head> <title>max-width</title> <style> .mx { max-width: 300px; border:3px solid green; } </style></head><body> <div class="mx"> if the text is more, than height increase, but fixed width </div></br></br> <div class="mx"> if the text less , then it has no change </div> </body> </html>