css: Fix outline CSS for informational overlays.
css: Fix outline CSS for informational overlays.

Fixes #6188 for real.

mahim97/zulip,zulip/zulip,shubhamdhama/zulip,dhcrzf/zulip,zulip/zulip,jackrzhang/zulip,kou/zulip,timabbott/zulip,verma-varsha/zulip,shubhamdhama/zulip,tommyip/zulip,dhcrzf/zulip,brainwane/zulip,hackerkid/zulip,Galexrt/zulip,showell/zulip,zulip/zulip,synicalsyntax/zulip,verma-varsha/zulip,punchagan/zulip,Galexrt/zulip,amanharitsh123/zulip,rishig/zulip,eeshangarg/zulip,kou/zulip,jackrzhang/zulip,dhcrzf/zulip,punchagan/zulip,kou/zulip,rishig/zulip,punchagan/zulip,tommyip/zulip,synicalsyntax/zulip,synicalsyntax/zulip,mahim97/zulip,timabbott/zulip,Galexrt/zulip,tommyip/zulip,zulip/zulip,eeshangarg/zulip,shubhamdhama/zulip,timabbott/zulip,rht/zulip,dhcrzf/zulip,brainwane/zulip,Galexrt/zulip,Galexrt/zulip,kou/zulip,showell/zulip,rishig/zulip,punchagan/zulip,punchagan/zulip,showell/zulip,eeshangarg/zulip,verma-varsha/zulip,kou/zulip,hackerkid/zulip,synicalsyntax/zulip,jackrzhang/zulip,zulip/zulip,mahim97/zulip,punchagan/zulip,amanharitsh123/zulip,andersk/zulip,showell/zulip,tommyip/zulip,dhcrzf/zulip,timabbott/zulip,dhcrzf/zulip,brockwhittaker/zulip,hackerkid/zulip,timabbott/zulip,brockwhittaker/zulip,eeshangarg/zulip,showell/zulip,rht/zulip,hackerkid/zulip,synicalsyntax/zulip,brainwane/zulip,synicalsyntax/zulip,showell/zulip,zulip/zulip,rishig/zulip,rishig/zulip,mahim97/zulip,tommyip/zulip,amanharitsh123/zulip,mahim97/zulip,amanharitsh123/zulip,brockwhittaker/zulip,andersk/zulip,timabbott/zulip,shubhamdhama/zulip,verma-varsha/zulip,andersk/zulip,rht/zulip,andersk/zulip,shubhamdhama/zulip,zulip/zulip,punchagan/zulip,jackrzhang/zulip,rht/zulip,shubhamdhama/zulip,Galexrt/zulip,amanharitsh123/zulip,timabbott/zulip,verma-varsha/zulip,dhcrzf/zulip,eeshangarg/zulip,rishig/zulip,hackerkid/zulip,eeshangarg/zulip,rht/zulip,tommyip/zulip,tommyip/zulip,kou/zulip,amanharitsh123/zulip,rht/zulip,brainwane/zulip,andersk/zulip,rishig/zulip,andersk/zulip,brainwane/zulip,hackerkid/zulip,brockwhittaker/zulip,jackrzhang/zulip,showell/zulip,eeshangarg/zulip,andersk/zulip,jackrzhang/zulip,brockwhittaker/zulip,kou/zulip,mahim97/zulip,jackrzhang/zulip,brainwane/zulip,Galexrt/zulip,synicalsyntax/zulip,shubhamdhama/zulip,rht/zulip,brainwane/zulip,hackerkid/zulip,verma-varsha/zulip,brockwhittaker/zulip