Simple Theme

[Felix]

Japanese characters in css - why are they needed here? Can they be removed?

Please check your website also how it looks on a Tablet and Smartphone

Those characters look more like chinese characters. Where is that css coming from ?
Did you develop your website locally or online ?
How are your fonts loaded, from an online service ?

Having these characters mixed in your css is strange.
You really should do a security check on your website:

https://observatory.mozilla.org/
https://uitest.com/