List of steps to reproduce (step by step, including full links if applicable):

• Go to French Wikipédia Home Page
• Make sure you are connected
• Click on "Plus"

or

• Go to French Wikipédia Content Translation Page
• Make sure you are connected

or

• Go to French Wikipédia Home Page
• Make sure you are connected
• Bring your cursor to "contributions" without clicking there

What happens?:
The font is bigger than usual

What should have happened instead?:
The font should be smaller

Software version (if not a Wikimedia wiki), browser information, screenshots, other information, etc:

Chrome information: Version 92.0.4515.107 (Build officiel) (64 bits)
I have no css which changes the font. I am under monobook.