css: Use SCSS nesting for `#send_controls`.
css: Use SCSS nesting for `#send_controls`.

timabbott/zulip,hackerkid/zulip,timabbott/zulip,punchagan/zulip,eeshangarg/zulip,shubhamdhama/zulip,brainwane/zulip,punchagan/zulip,zulip/zulip,synicalsyntax/zulip,andersk/zulip,hackerkid/zulip,synicalsyntax/zulip,hackerkid/zulip,shubhamdhama/zulip,rht/zulip,eeshangarg/zulip,shubhamdhama/zulip,rht/zulip,shubhamdhama/zulip,zulip/zulip,synicalsyntax/zulip,timabbott/zulip,synicalsyntax/zulip,punchagan/zulip,shubhamdhama/zulip,hackerkid/zulip,kou/zulip,punchagan/zulip,kou/zulip,timabbott/zulip,punchagan/zulip,rht/zulip,rht/zulip,andersk/zulip,kou/zulip,hackerkid/zulip,zulip/zulip,brainwane/zulip,eeshangarg/zulip,hackerkid/zulip,punchagan/zulip,brainwane/zulip,brainwane/zulip,timabbott/zulip,showell/zulip,eeshangarg/zulip,eeshangarg/zulip,brainwane/zulip,synicalsyntax/zulip,showell/zulip,punchagan/zulip,showell/zulip,eeshangarg/zulip,rht/zulip,zulip/zulip,shubhamdhama/zulip,synicalsyntax/zulip,kou/zulip,zulip/zulip,rht/zulip,rht/zulip,zulip/zulip,timabbott/zulip,kou/zulip,kou/zulip,brainwane/zulip,showell/zulip,andersk/zulip,showell/zulip,andersk/zulip,andersk/zulip,showell/zulip,showell/zulip,synicalsyntax/zulip,kou/zulip,timabbott/zulip,eeshangarg/zulip,hackerkid/zulip,andersk/zulip,brainwane/zulip,zulip/zulip,andersk/zulip,shubhamdhama/zulip