How th buttons in this video have color automatically we diid not coloured it

#1

how th buttons in this video have color automatically we diid not coloured it

#2

bhaiya we use website in corporate world and for clients are made from bootstrap . is it a good practice

#3

Color was given because of the bootstrap classes assigned. The classes defined in bootstrap have the colors.
Yes, you can use bootstrap in production.

#4

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