Related to ZBX-19531. Reported "Fixed", but the issue still continues.

TH refers to "vertical_rotation", but no reference exists in any of the CSS associated.

blue-style.css has a close reference to "vertical_rotation_inner",

Changing to "vertical_rotation" does rotate the headers correctly, however table header offset etc are totally misaligned at that moment.

Checked with other Themes. Same issue.

Please review CSS to include "vertical_rotation"; not sure where that piece of CSS got lost.