While changing color themes, the website looks glitched out while dragging on the color picker.

i was unable to reproduce this. could you provide instructions on how to reproduce this and also what browser you are running? do you have any extensions installed? try running chrome/firefox on a different profile or on safe mode (i.e. without extensions). also it may be useful to provide screenshots of the "glitchedness"

have you tried turning your computer on and off again?

using chrome v91 here. no issues

try mentioning which were the web browsers and their versions you were using, which operating systems and versions, etc.

i actually found no issues everywhere: using the browsers brave (i hate it but it's among the few ones based on chromium isn't crashing here), vivaldi, opera, waterfox, otter, falkon, palemoon, seamonkey, midori, etc., (in all versions since all the time i accessed botb), on gnu/linux ('m mostly using gnu/linux: ubuntu 21.04)