A mix of both tbh. I use bootstrap but only a small percentage of it and less for the 'looks' it's super useful for quick layout structures and a couple JS features (tabs for example) which is what I use it for mainly. (some pages are also 100% own css.) Anything else is own CSS. I kinda dislike the default looks of most frameworks so I add a ton of stuff myself.
I use bootstrap, but like skykristal it's also more for the layouts/responsive design than the look. Though i've been trying to switch more to my own CSS, just to cut back on how many mods I need to do to get it the way I want to look
Okay floats are working now. Now they aren't centered in the middle