Today we checked that WordPress on our site is the latests: 5.3.2
We tried the code you suggest, but it did not resolve the issue.
This is a copy of the changed code:
/* to fix an issue with some themes/plugins that set box-sizing: border-box */
.ewz-dialog::before, .ewz-dialog, .ewz-dialog::after{
box-sizing: content-box !important;
-webkit-box-sizing: content-box !important;
}
We checked that we had the latest version of our theme, Flatsome: 3.10.3
Tomorrow we’ll start looking at our plugins.