Information modals are now responsive on smaller screens.
Information modals are now responsive on smaller screens.

- Added a media query for `max-width: 768px` where the changes in the
css will take place.
- This fix also makes the navigation menu responsive.

Tweaked by tabbott to better contain the CSS to this module.

Fixes #4022.

eeshangarg/zulip,Galexrt/zulip,showell/zulip,zulip/zulip,j831/zulip,punchagan/zulip,j831/zulip,verma-varsha/zulip,shubhamdhama/zulip,synicalsyntax/zulip,j831/zulip,shubhamdhama/zulip,hackerkid/zulip,jrowan/zulip,amanharitsh123/zulip,brockwhittaker/zulip,christi3k/zulip,ryanbackman/zulip,amanharitsh123/zulip,christi3k/zulip,synicalsyntax/zulip,andersk/zulip,amanharitsh123/zulip,ryanbackman/zulip,synicalsyntax/zulip,dhcrzf/zulip,jainayush975/zulip,punchagan/zulip,christi3k/zulip,SmartPeople/zulip,hackerkid/zulip,SmartPeople/zulip,timabbott/zulip,synicalsyntax/zulip,andersk/zulip,zulip/zulip,shubhamdhama/zulip,mahim97/zulip,vabs22/zulip,jphilipsen05/zulip,rht/zulip,jackrzhang/zulip,jackrzhang/zulip,jainayush975/zulip,kou/zulip,rishig/zulip,vaidap/zulip,aakash-cr7/zulip,brainwane/zulip,jainayush975/zulip,eeshangarg/zulip,Galexrt/zulip,aakash-cr7/zulip,eeshangarg/zulip,jainayush975/zulip,jrowan/zulip,zulip/zulip,jackrzhang/zulip,punchagan/zulip,vaidap/zulip,kou/zulip,ryanbackman/zulip,SmartPeople/zulip,aakash-cr7/zulip,shubhamdhama/zulip,vabs22/zulip,eeshangarg/zulip,kou/zulip,Galexrt/zulip,verma-varsha/zulip,brainwane/zulip,j831/zulip,hackerkid/zulip,jackrzhang/zulip,eeshangarg/zulip,dhcrzf/zulip,hackerkid/zulip,andersk/zulip,aakash-cr7/zulip,zulip/zulip,tommyip/zulip,jphilipsen05/zulip,punchagan/zulip,rishig/zulip,kou/zulip,timabbott/zulip,dhcrzf/zulip,j831/zulip,ryanbackman/zulip,timabbott/zulip,dhcrzf/zulip,hackerkid/zulip,zulip/zulip,verma-varsha/zulip,aakash-cr7/zulip,punchagan/zulip,vabs22/zulip,Galexrt/zulip,jrowan/zulip,rishig/zulip,Galexrt/zulip,jrowan/zulip,SmartPeople/zulip,vabs22/zulip,rishig/zulip,brainwane/zulip,punchagan/zulip,showell/zulip,brainwane/zulip,Galexrt/zulip,shubhamdhama/zulip,verma-varsha/zulip,christi3k/zulip,ryanbackman/zulip,verma-varsha/zulip,andersk/zulip,amanharitsh123/zulip,mahim97/zulip,andersk/zulip,jphilipsen05/zulip,rht/zulip,timabbott/zulip,shubhamdhama/zulip,dhcrzf/zulip,showell/zulip,vabs22/zulip,showell/zulip,rht/zulip,mahim97/zulip,tommyip/zulip,synicalsyntax/zulip,jainayush975/zulip,synicalsyntax/zulip,rht/zulip,jrowan/zulip,jackrzhang/zulip,jackrzhang/zulip,brainwane/zulip,brockwhittaker/zulip,jphilipsen05/zulip,hackerkid/zulip,zulip/zulip,kou/zulip,jainayush975/zulip,kou/zulip,brockwhittaker/zulip,SmartPeople/zulip,jphilipsen05/zulip,mahim97/zulip,andersk/zulip,rishig/zulip,Galexrt/zulip,christi3k/zulip,mahim97/zulip,christi3k/zulip,tommyip/zulip,brainwane/zulip,rht/zulip,brockwhittaker/zulip,timabbott/zulip,rishig/zulip,showell/zulip,amanharitsh123/zulip,hackerkid/zulip,vaidap/zulip,ryanbackman/zulip,jackrzhang/zulip,amanharitsh123/zulip,zulip/zulip,showell/zulip,vaidap/zulip,eeshangarg/zulip,dhcrzf/zulip,timabbott/zulip,vaidap/zulip,punchagan/zulip,SmartPeople/zulip,rht/zulip,tommyip/zulip,kou/zulip,brainwane/zulip,verma-varsha/zulip,tommyip/zulip,synicalsyntax/zulip,rishig/zulip,j831/zulip,andersk/zulip,eeshangarg/zulip,jphilipsen05/zulip,tommyip/zulip,aakash-cr7/zulip,mahim97/zulip,brockwhittaker/zulip,dhcrzf/zulip,rht/zulip,jrowan/zulip,vaidap/zulip,shubhamdhama/zulip,brockwhittaker/zulip,timabbott/zulip,showell/zulip,tommyip/zulip,vabs22/zulip