How do I adjust the button size

Question

In this code if you try to click on the image button it works but there's a huge invisible boundary that gets highlighted on holding/clicking it. Anyway way I can remove that? I'm not good at CSS.
https://code.sololearn.com/WV8KgyUTZHAV/?ref=app
https://code.sololearn.com/WV8KgyUTZHAV/?ref=app

Answer 1

Dead Scripter
no such thing is visible to me, Try
set button css property

outline: none;
user-select: none;

Answer 2

Thanks

Answer 3

Dead Scripter did that worked ??

Answer 4

NonStop CODING yea