fixing centering bug with contribute
Relates to https://gitlab.com/gitlab-com/marketing/inbound-marketing/growth/-/issues/1163#note_532750305
Fixing a width/centering bug on the GitLab Contribute page
Relates to https://gitlab.com/gitlab-com/marketing/inbound-marketing/growth/-/issues/1163#note_532750305
Fixing a width/centering bug on the GitLab Contribute page