CiviCRM css affects Drupal core

Replacing with more specific selector:
<code>
#crm-container .primary {
FONT-WEIGHT: bold
}
</code>

— original post —
The following rule in civicrm.css needs either to be removed or to have more specificity as it causes the primary tabs in Drupal pages to be bold:

<code>
.primary {
FONT-WEIGHT: bold
}
</code>