Hi!
Yes, both possible actually. First, make sure to have the close icon enabled. Then use this custom CSS to hide it on devices with resolution above 479px:
[html]@media only screen and (min-device-width: 479px) {
.proclose {
display: none !important;
}
}[/html]
Then, to remove the border from around the icon, use this custom CSS:
[html].proclose svg {
box-shadow: none !important;
}[/html]
I hope this helps!