_content/css: hide cookie banner in print view

Fixes golang/go#60820.

Change-Id: I99943604c8588264f2898b0011b0135778a15628
Reviewed-on: https://go-review.googlesource.com/c/website/+/503879
Run-TryBot: Jamal Carvalho <jamal@golang.org>
TryBot-Result: Gopher Robot <gobot@golang.org>
Reviewed-by: Hyang-Ah Hana Kim <hyangah@gmail.com>
diff --git a/_content/css/styles.css b/_content/css/styles.css
index ac16b4b..a1982d3 100644
--- a/_content/css/styles.css
+++ b/_content/css/styles.css
@@ -5320,3 +5320,10 @@
 .Cookie-notice--visible {
   display: flex;
 }
+
+@media print {
+  .Cookie-notice,
+  .Cookie-notice--visible {
+    display: none;
+  }
+}