Observation Details
The page uses HTML list element in section "Unsere Smartphone-Tarife" to list the cards.
class="cards-cta-card-group"
On the other hand, a list is not used in section "Weitere Mobilfunk-Tarife" which follows the same card structure.
Remediation Notes
Ensure consistent use of semantic HTML structure. If lists are used for a section with a list of cards, ensure using lists for all similar structured sections. This will create a better user experience, as the user will expect the same structure for similar sections.