After several hours of investigating problem with printing backgrounds in Drupal admin pages, I have found the code in core/themes/seven/css/base/print.css file:
@media print {
* {
color: #000 !important; /* Black prints faster: h5bp.com/s */
background-color: transparent !important;
box-shadow: none !important;
text-shadow: none !important;
}
Why Drupal use so hard rules with !important for reset all colors and background on all admin page elements? Those overrides very hard to find for regular users, and not so easy to override via custom css rules.
As result, regular Drupal users by default have problems with printing colored elements in admin pages,with default Seven theme, and can't easily understand where can be the problem?
So, maybe remove this global override with !important and replace it with direct rules only for needed elements?
Needs work
2.0
Code
The patch will have to be re-rolled with new suggestions/changes described in the comments in the issue.
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It's likely this issue predates Contrib.social: some issue and comment data are missing.
Issue #3057822: Remove overriding colors and backgrounds in print.css
Automatically closed - issue fixed for 2 weeks with no activity.