In this repo you can find two HTML files. Sample-Without-Bootstrap should be refered first. Then you can gain simple knowledge about how We can style a button using Pure CSS. In Sample-With-Bootstrap you can see how we can Add bootstrap classes for a button and how it works in web site. If you have any issue feelfree to contact me. For further references you can visit Bootstrap official web site. https://getbootstrap.com/docs/5.3/getting-started/introduction/