Hi there,
We are updating a site at http://www.evergreen-alpineacademy.com/
There is a row with 4 flip-boxes, however they are a bit buggy on tablet.

I’d like to have these boxes break to 2x2 on tablet.
I’ve added the class four-boxes to the section they are in, and added the below code through the Customizer… It’s not working though, can you please help me work out what is wrong?
@media screen and (max-width: 767px) {
.four-boxes .x-column {
margin-bottom: 1%;
width: 49%;
margin-right: 1%;
}
}
@media screen and (max-width: 480px) {
.four-boxes .x-column {
margin-bottom: 5%;
width: 100%;
margin-right: 0;
}
}

