refactor: Remove obsolete .messagebox-bottom-colorblock.
refactor: Remove obsolete .messagebox-bottom-colorblock.

zulip/zulip,eeshangarg/zulip,shubhamdhama/zulip,andersk/zulip,hackerkid/zulip,dhcrzf/zulip,brainwane/zulip,jackrzhang/zulip,tommyip/zulip,andersk/zulip,synicalsyntax/zulip,rht/zulip,andersk/zulip,synicalsyntax/zulip,rishig/zulip,rishig/zulip,dhcrzf/zulip,hackerkid/zulip,andersk/zulip,zulip/zulip,synicalsyntax/zulip,tommyip/zulip,kou/zulip,shubhamdhama/zulip,showell/zulip,rht/zulip,synicalsyntax/zulip,kou/zulip,timabbott/zulip,eeshangarg/zulip,rishig/zulip,eeshangarg/zulip,synicalsyntax/zulip,kou/zulip,hackerkid/zulip,timabbott/zulip,dhcrzf/zulip,kou/zulip,rishig/zulip,punchagan/zulip,punchagan/zulip,rht/zulip,tommyip/zulip,punchagan/zulip,jackrzhang/zulip,punchagan/zulip,dhcrzf/zulip,zulip/zulip,showell/zulip,timabbott/zulip,zulip/zulip,jackrzhang/zulip,shubhamdhama/zulip,eeshangarg/zulip,synicalsyntax/zulip,zulip/zulip,jackrzhang/zulip,rht/zulip,synicalsyntax/zulip,tommyip/zulip,eeshangarg/zulip,showell/zulip,shubhamdhama/zulip,punchagan/zulip,showell/zulip,punchagan/zulip,timabbott/zulip,rishig/zulip,brainwane/zulip,timabbott/zulip,showell/zulip,timabbott/zulip,kou/zulip,zulip/zulip,showell/zulip,shubhamdhama/zulip,brainwane/zulip,jackrzhang/zulip,brainwane/zulip,hackerkid/zulip,dhcrzf/zulip,zulip/zulip,kou/zulip,rht/zulip,jackrzhang/zulip,tommyip/zulip,jackrzhang/zulip,rishig/zulip,showell/zulip,brainwane/zulip,hackerkid/zulip,tommyip/zulip,shubhamdhama/zulip,andersk/zulip,kou/zulip,brainwane/zulip,andersk/zulip,eeshangarg/zulip,tommyip/zulip,eeshangarg/zulip,rht/zulip,dhcrzf/zulip,dhcrzf/zulip,hackerkid/zulip,rht/zulip,andersk/zulip,rishig/zulip,brainwane/zulip,timabbott/zulip,hackerkid/zulip,shubhamdhama/zulip,punchagan/zulip