Why use "style" in the php ?

[Zatalyz]

I try to customize a theme, and I see a strange thing. In the php files, there are a lot of "style", like this :

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<input type="submit" style="margin-top: 1em;" value="', $txt['login'], '" class="button_submit">'

I also find this kind of thing in the default theme. I was learn that this was a bad practice, that everything about style should be declared in the css, with "class". But there are so many of them, everywhere, that I come to doubt: is there a reason for using this, instead of class?

[Antechinus]

Yes. The reason is laziness. Someone either didn't find it, or just hit it with something large and heavy during testing and forgot about it afterwards. Feel free to get rid of it and use your own CSS if you prefer.

[mark@123]

Yes, This bad practice and get rid off and made your own css file and  kept all css in seperate css folder.

[Zatalyz]

Thanks So, no regret !
I clean this code massively 

[Antechinus]

There is plenty to keep you busy. I've had a go at it a few times. The best thing about default 20.x code is how much you can throw out and still have it work,