diff --git a/core/core.php b/core/core.php
index 2696767f..ae6ddd19 100644
--- a/core/core.php
+++ b/core/core.php
@@ -2606,6 +2606,7 @@ class core extends common {
 			// TinyMCE
 			$css .= 'body:not(.editorWysiwyg),span .zwiico-help {color:' . $this->getData(['admin','colorText']) . ';}';
 			$css .= 'table thead tr, table thead tr .zwiico-help{ background-color:'.$this->getData(['admin','colorText']).'; color:'.$colors['text'].';}';
+			$css .= 'table thead th { color: ' . $this->getData(['admin','colorText']) . '; filter: invert(100%);}';
 			$colors = helper::colorVariants($this->getData(['admin','backgroundColorButton']));
 			$css .= 'input[type="checkbox"]:checked + label::before,.speechBubble{background-color:' . $colors['normal'] . ';color:' .  $colors['text'] . ';}';
 			$css .= '.speechBubble::before {border-color:' . $colors['normal'] . ' transparent transparent transparent;}';