Pick the colours you want the site and the builder in. 6 schemes, all free, applied across the whole site the moment you choose one, with no account needed.
Three light and three dark, so the site is comfortable in daylight and at night. The choice is remembered on this phone or computer, so you do not have to pick again.
Changing the colours does not change how the apps you build look; it changes only BanglaCodes' own pages. To preview one, put ?theme=cream on the end of any address.