Fix report-template css
Fix report-template css

Demo: https://dev-benjhayden-1573840-dot-chromeperf.appspot.com
(The edit button only works on v2spa-dot-chromeperf.appspot.com, so you
can use devtools to click the hidden iron-icon#edit.)

Change-Id: I163ef49460999a3ab49cf2a6e23c663a37102d6f
Reviewed-on: https://chromium-review.googlesource.com/c/catapult/+/1573840
Reviewed-by: Tiffany Zhang <72ba896c194c60df650ffdf25b6a261246a877c1@chromium.org>
Commit-Queue: Ben Hayden <d3ffe0e065c2328e497bb32a07f4dcb29138ef5b@chromium.org>

catapult-project/catapult,catapult-project/catapult,catapult-project/catapult,catapult-project/catapult,catapult-project/catapult,catapult-project/catapult,catapult-project/catapult