content/static: add break word unit details

Breaks words in unit details to fix overflow issue on
portrait mobile screens.

Change-Id: I70e205c39c4454e3f65835ad9fadf363b62c438b
Reviewed-on: https://go-review.googlesource.com/c/pkgsite/+/259857
Trust: Jamal Carvalho <jamal@golang.org>
Run-TryBot: Jamal Carvalho <jamal@golang.org>
Reviewed-by: Julie Qiu <julie@golang.org>
TryBot-Result: kokoro <noreply+kokoro@google.com>
diff --git a/content/static/css/unit_details.css b/content/static/css/unit_details.css
index 961322a..7394845 100644
--- a/content/static/css/unit_details.css
+++ b/content/static/css/unit_details.css
@@ -20,6 +20,7 @@
   max-width: 98rem;
   min-height: 32rem;
   padding: 0.5rem 1rem;
+  word-break: break-word;
 }
 @media only screen and (min-width: 57.7rem) {
   .UnitDetails {