content/static: fix site padding on non unit pages

Fixes the site padding on license policy, search,
search help, and homepage.

Change-Id: I88d8b00390ef968de2c993308d5337732360aa88
Reviewed-on: https://go-review.googlesource.com/c/pkgsite/+/260722
Trust: Jamal Carvalho <jamal@golang.org>
Run-TryBot: Jamal Carvalho <jamal@golang.org>
TryBot-Result: kokoro <noreply+kokoro@google.com>
Reviewed-by: Julie Qiu <julie@golang.org>
diff --git a/content/static/css/stylesheet.css b/content/static/css/stylesheet.css
index 57b0930..75fd9ff 100644
--- a/content/static/css/stylesheet.css
+++ b/content/static/css/stylesheet.css
@@ -116,7 +116,7 @@
   flex: 1;
   padding: 0 1rem;
 }
-.Site--redesign .Site-content {
+.Site--redesign.Site--wide .Site-content {
   padding: 0;
 }
 .Site-footer {
@@ -126,7 +126,7 @@
   .Site-content {
     padding: 0 1.5rem;
   }
-  .Site--redesign .Site-content {
+  .Site--redesign.Site--wide .Site-content {
     padding: 0;
   }
 }