Ok, the solution is simple and working for everyone else:
transform the style below:
#responsive-menu-pro-container, #responsive-menu-pro-container:before, #responsive-menu-pro-container:after, #responsive-menu-pro-container *, #responsive-menu-pro-container *:before, #responsive-menu-pro-container *:after {
box-sizing: border-box;
margin: 0;
padding: 0;
}
in this style below:
#responsive-menu-pro-container, #responsive-menu-pro-container:before, #responsive-menu-pro-container:after {
box-sizing: border-box;
margin: 0;
padding: 0;
}
So, remove “#responsive-menu-pro-container *, #responsive-menu-pro-container *:before, #responsive-menu-pro-container *:after” that is not useful for anybody and cause only style ploblems for contents added to Additional Content area.