I used to do web site la more often in the html3 and 4 days and would code my own CSS. I just learned bootstrap a month ago and my take is too use it as a reference tool or for tutorial/learning projects.
It does a lot prepackaged and that's great, if I want to do something serious or larger I like to look up their examples or classes I use often and copy those to my own CSS and make modifications.
It's great when you need it to work quick, but sometimes you need to "own" your code a little more
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