Limit scope of external css to only a specific page?

I am creating a django project using HTML5, and CSS,.

while extending the base.html to other files ,when I load in a new css file, it (obviously) overrides the one I'm using to style the page, and therefore most of the elements are affected like a tag and others. so is there Limit scope of external css to only a specific file.? Please tell me some solution i am a beginner and i am frustrated by this

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