Test on multiple browsers and devices & fix issues

[dboyd13]

No description provided.

[gustavolwalker]

Hello, I test on Mozilla Firefox 60.0.2 on Ubuntu 18.04 and buttons on preferences burst, I suggest using width: 20%:

div.sectionleft { float: left; display: block; width: 20%; background-color: #404040; margin: 5px; padding: 5px; font-size: 13px; border: 3px solid lightgray; border-radius: 8px; }