landing_page: Avoid gradient overflowing under content.
landing_page: Avoid gradient overflowing under content.

Gradient under content makes links which are of similar color
hard to see.

zulip/zulip,zulip/zulip,eeshangarg/zulip,rht/zulip,kou/zulip,eeshangarg/zulip,kou/zulip,zulip/zulip,eeshangarg/zulip,zulip/zulip,rht/zulip,eeshangarg/zulip,eeshangarg/zulip,kou/zulip,andersk/zulip,andersk/zulip,zulip/zulip,rht/zulip,andersk/zulip,andersk/zulip,rht/zulip,zulip/zulip,kou/zulip,andersk/zulip,eeshangarg/zulip,kou/zulip,zulip/zulip,eeshangarg/zulip,rht/zulip,andersk/zulip,rht/zulip,kou/zulip,rht/zulip,kou/zulip,andersk/zulip