I'm using VSC formatter Prettier, how do I get rid of this red color?

Prettier is in use as html, css formatter. I think the other formatters are working fine If I only use Prettier, I get a red color like the one in the image below.

VSC 적용 사진 : The image is not uploaded, so I am uploading it to the image site!

It doesn't interfere with the use of the cord, but I want to get rid of that red color. If anyone knows, could you help me?