Enable developer mode Go to Site administration > Development > Template library Search for notification Check the x button on the notification_xx templates on the accessibility tree Confirm that the close button is nicely aligned at the top right-hand corner of the notification alert. Using the " Select an element in the page " button on the browser dev tools, hover on the close button's " x " to inspect it. Check the " Contrast " value. Confirm that it has a colour contrast ratio greater than 3.