To customize waypoints in CSS class

Hi,

First of all, congratulations for this very useful plugin for building my hiking site. In Elevation Profiles, I would like to customize my waypoints like this with DIVI builder (in the block, Parameters/Advanced/Customize CSS) :

.elevation-waypoint-icon.waypoint-css:before {
	background: url(https://www.alpes-sud-photos.com/dev/wp-content/uploads/2023/01/localisation.png) no-repeat 50%/contain;
}

But after the first line in this code, I have a message error “Expected RBRACE.” and after the last line, I have another message error “Unexpected token ‘}’.” I’m not a specialist in CSS coding, but there must be a few references missing in my code. Would you have a solution to this problem? Thanks for your help.