Writing non css in the css

Hej!
If inserted in my css (clicked on edit CSS) the following string "<style>", i wanted to see if you escape or remove it. but it got saved.
1) i think you should remove every tag like string
2) maybe you can also use a css-validator on the server-side and deny saving when it is invalid css.
3) could you please remove this from my css (bastilian.soup.io)
</style>
Inappropriate?
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