Did you know that chrome dev tools has a css overview panel to identify flaws inside your css?
You may first need to enable that feature because its an experimental feature.
- First open your Dev-Tools settings(the ⚙️ on the right or Press F1)
- Go to Experimental
- here you should find the checkbox "CSS Overview"
You can find it when you open your dev-tools in chrome (F12) and than More options() More > More tools > CSS Overview.
Here you can get an high level overview of you page's css
In the colors section you can see all the colors you used and it even indicates bad contrasts in your css.
I hope you learned something just as i did =)