or, u could go for

do note that editing the .button element changes ALL the buttons on the page, lol
i believe i learnt this code from aime. aime is code lifesaver

increase the seconds of transition (the section in the css that says transition: 0s;) like 0.3s to make it smooth instead of just increasing the size on hover
if u hate the chunky gap thing i believe margin: 0 !important; in the button element would work idk