Avoid the background invisible when selecting text with background color

Author: SiriusXT

apps/client/src/stylesheets/style.css

@@ -1222,6 +1222,10 @@ body:not(.mobile) #launcher-pane.horizontal .dropdown-submenu > .dropdown-menu {
     background-color: inherit;
 }
 
+::selection {
+    background-color: #3399FF70;
+}
+
 [data-bs-toggle="tooltip"]:not(.button-widget) span {
     padding-bottom: 0;
     border-bottom: 1px dotted;