Set the color of the text in the "help" page to the theme's text color....

src/contents/ui/HelpPage.qml

@@ -7,6 +7,7 @@
 import QtQuick 2.1
 import org.kde.kirigami 2.6 as Kirigami
 import QtQuick.Layouts 1.14
+import QtQuick.Controls 2.15 as QQC2
 
 Kirigami.ScrollablePage {
     title: i18n("Help")
@@ -16,26 +17,27 @@ Kirigami.ScrollablePage {
             Layout.fillWidth: true
             level: 1
             text: i18n("Contrast")
-        } 
-        Text {
+        }
+        QQC2.Label {
             Layout.fillWidth: true
             wrapMode: Text.WordWrap
             text: i18n("Contrast is the difference in color between two objects that allows them to be distinguished. In visual perception of the real world, contrast is determined by the difference in the color and brightness of the object and other objects within the same field of view.")
         }
-        Text {
+        QQC2.Label {
             Layout.fillWidth: true
             wrapMode: Text.WordWrap
             text: i18n("A contrast value of 21 indicates a perfect contrast (usually black on white), and a value of 0 indicate that the two colors are the same.")
         }
-        Text {
+        QQC2.Label {
             Layout.fillWidth: true
             wrapMode: Text.WordWrap
             text: i18n("For normal text, the contrast ratio should be at least of 4.5 to conform to the WCAG AA standard and a contrast ratio of 7 or more is required to conform with the WCAG AAA standard.")
         }
-        Text {
+        QQC2.Label {
             Layout.fillWidth: true
             wrapMode: Text.WordWrap
             text: i18n("For large text, the contrast ratio should be at least of 3 to conform to the WCAG AA standard and a contrast ratio of 4.5 or more is required to conform with the WCAG AAA standard.")
         }
     }
 }
+