Email Separator Lines Not Displaying in Chrome/Opera Browsers

[Aviator]

Good Day!

We're currently using Roundcube (Skin: Larry) with both the Chrome and Opera browsers.

The email separator (vertical and horizontal) lines do not display on a consistent basis. Their display depends on the browser zoom level. At 100% and 110%, for example, display is not that great. However, on MS Edge and Firefox they always display well on a consistent basis. Click below for details.

Poor Display:

Chrome (Zoom Level 110%): http://prntscr.com/qtldi8
Opera (Zoom Level 110%): http://prntscr.com/qtla7t

Good Display:

MS Edge (Zoom Level 110%): http://prntscr.com/qtlh60
Firefox (Zoom Level 110%): http://prntscr.com/qtli7s

We checked our browsers' settings and, from what we can tell, they have been set the same way.

Has anyone experienced this issue? If so, how did you solve it?

Cheers!

[SKaero]

I suggest not zooming the browser, the way each browser handles scaling is different and often not great. It is common to have broken display elements when zoomed.