content/static: gray out jump to button when disabled

Adds gray background to button when disabled.
Adds transparent background to jump to icon
to fix ui when button is disabled.

Change-Id: I49e48bb92a2cbbc97645eb3d56e05b90c170000d
Reviewed-on: https://go-review.googlesource.com/c/pkgsite/+/264204
Trust: Jamal Carvalho <jamal@golang.org>
Run-TryBot: Jamal Carvalho <jamal@golang.org>
Reviewed-by: Julie Qiu <julie@golang.org>
diff --git a/content/static/css/unit_outline.css b/content/static/css/unit_outline.css
index 8708d23..a4567a1 100644
--- a/content/static/css/unit_outline.css
+++ b/content/static/css/unit_outline.css
@@ -91,3 +91,6 @@
   text-align: center;
   top: 0.5rem;
 }
+.UnitOutline-jumpToInput:disabled {
+  background-color: var(--gray-9);
+}
diff --git a/content/static/img/pkg-icon-jumpTo_16x16.svg b/content/static/img/pkg-icon-jumpTo_16x16.svg
index 905cd5e..dcaad7b 100644
--- a/content/static/img/pkg-icon-jumpTo_16x16.svg
+++ b/content/static/img/pkg-icon-jumpTo_16x16.svg
@@ -1 +1 @@
-<svg width="16" height="16" xmlns="http://www.w3.org/2000/svg"><defs><filter height="200%" width="200%" y="-50%" x="-50%" id="a"><feGaussianBlur stdDeviation=".2"/></filter><filter id="c"><feGaussianBlur stdDeviation=".2"/></filter><filter id="b"><feGaussianBlur stdDeviation=".2"/></filter></defs><path fill="none" d="M-1-1h802v602H-1z"/><g><path d="M-1-1h18v18H-1V-1z" fill="#fff"/><g fill="#4c4c4c"><path d="M1.992 4h12v1h-12V4z" filter="url(#a)"/><path d="M5.962 10.367h4v1h-4v-1z" filter="url(#b)"/><path d="M4.085 7.13h8v1h-8v-1z" filter="url(#c)"/></g></g></svg>
\ No newline at end of file
+<svg width="16" height="16" xmlns="http://www.w3.org/2000/svg"><defs><filter id="a" x="-50%" y="-50%" width="200%" height="200%"><feGaussianBlur stdDeviation=".2"/></filter><filter id="c"><feGaussianBlur stdDeviation=".2"/></filter><filter id="b"><feGaussianBlur stdDeviation=".2"/></filter></defs><path fill="none" d="M-1-1h802v602H-1z"/><g><path d="M-1-1h802v602H-1V-1z" fill="none"/><path fill="none" d="M-.823-1h18v18h-18V-1z"/><g fill="#4c4c4c"><path filter="url(#a)" d="M2.169 4h12v1h-12V4z"/><path filter="url(#b)" d="M6.139 10.367h4v1h-4v-1z"/><path filter="url(#c)" d="M4.262 7.13h8v1h-8v-1z"/></g></g></svg>