We aim to make all website text, graphics and icons the correct contrast ratio according to sections 1.4.3 [Tip: hold Ctrl and click a link to open it in a new tab. (Hide tip)] and 1.4.11 of the WCAG criteria. We are aware of the following areas where the colour contrast ratio requires changing to meet these criteria: the navigation links used within the main website header, the experiment 'Materials' filter setting, the 'Popular experiments' title text and the 'Home' navigation link used at the bottom of experiment pages.