If on your monitor the text looks too small or too thin you can adjust these properties in your Marvins settings.
Click on the menu at the top right and go to "Settings".
Under the tab called "Font size/weight" you can adjust the size and thickness of the text.
To reset the font settings to the default, click the "reset" link on the very right.
Font settings per device
The font settings get saved on each device, not in your synced database. This means if you adjust the font size on your laptop at home, the settings on your computer at work will be unchanged.
This way you can get the ideal font size and thickness for each device.