portico: Adjust integration box spacing on mobile.
portico: Adjust integration box spacing on mobile.

This gives the integration boxes on the homepage a little more
space on very small viewports (<450px).

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