"Remove" inherited styles

Hi everyone! There's an internal tool we are using at work and I really, really can't get used to it because I find it too ugly and not very friendly. I'm writing a tampermonkey script to make the interface more pleasing to use. I haven't encountered any issues so far, but I'm kind of annoyed when I style my stuff and it inherits certain styles from the base site. I currently have one "entry point" dev element where I inject the rest of my own stuff, so I thought about using it to completely "remove" all inherited styles and use my own. Is that possible? Thanks in advance!

PS: don't worry, the company doesn't care as long as I don't break anything for everyone else. Since I'm working in a team of a lot of people, I decided to preserve the old look and just "switch back" to it when I need someone to look at something.
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