Hi,
It is possible, please go to Mega Menu > Menu Themes > Custom Styling and add the following:
(I am attempting to paste in some code but the new gutenberg editor has decided to not let me paste. I will try in a follow up reply)
Regards,
Tom
@include mobile {
/* The next code block adds a close button to the slide in mobile menu, change color, font-size and use left or right to position it */
#{$wrap} .mega-menu-toggle.mega-menu-open + #{$menu}:after {
content: '\f158';
font-family: 'dashicons';
font-size: 30px;
margin: 0;
display: block;
right: 10px;
top: 0;
cursor: pointer;
color: white;
position: absolute;
}
}