WCAG success criterion: color is not used as the only visual means to inform, indicate an action, elicit a response, or distinguish a visual element. The selected menu item, as well as the selected appointment setting (highlighted in red are merely indicated by color highlighting. An additional symbol, an underline or bold is not given. The required contrast ratio of at least 3:1 to the other menu items or appointment icons is is not met with a value of 2:1. In particular, this makes it difficult for visually impaired users to recognize the active element and thus its current selection or position within the website.

The menu item marked in red is only highlighted in color. There is no additional symbol, underlining or bolding given. The required contrast ratio of at least 3:1 to the other menu items (highlighted in yellow) is not met with a value of 2.4:1. Furthermore, it is only indicated in color that the menu item is currently selected and the corresponding page is displayed.
The required contrast ratio of the control element to the background is also too low with a value of 1.6:1. This makes it difficult for visually impaired users in particular to recognize the menu element and distinguish it from other menu elements. Since this is a deactivated control element, this is considered to be a minor anomaly.