fkeszi
If you want to change via LESS file, you can edit in this file: root/templates/ja_events_ii/acm/slideshow/less/style.less
Around line 96, look for this declaration:
.item {
position: relative;
max-height: 1320px;
&:before {
background: rgba(0,0,0,0.25);
content: "";
position: absolute;
top: 0;
left: 0;
right: 0;
bottom: 0;
z-index: 2;
}
and change or remove the background.
Note that when you edit the LESS file, if your site is running with Development Mode (check in template manager: http://prntscr.com/j9asbi ), just refresh the frontend to see the changes. In case the Dev mode is OFF now, you will need to compile LESS to CSS first: http://prntscr.com/j9asf6 and do remember to backup all CSS files before compiling.
Regards