button hover css affects all buttons in course

using moodle 3.6.3 with (slightly adapted) Boost theme

lines 1780 and 1781 in styles.css affect ALL buttons in a course:

/Adaptable theme buttons/
.format-tiles .btn:hover,
.format-tiles .btn:active,

this makes them behave weird, as they seem to disappear on mouseover.

what is the reason for this css, and will there likely be any side issues to commenting out those two lines?

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