How to Properly Modify CSS Files?

[Dkf]

Hello everyone,
Here's the situation - I don't edit CSS templates directly but create a "template modification."
I do everything correctly and simply, for example:
Find: min-height: 260px;
Replace with: min-height: 400px;

After I activate this, the main page of the forum completely loses its CSS layout, turning into a jumble of words. In the forum console, I get tens of thousands of errors per minute of approximately the following content:

Code:

Server error log
ErrorException...

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How to Properly Modify CSS Files?

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