YouTube thumbnail: Educational graphic promoting a Power BI tutorial focused on colour contrast and accessibility. A smiling woman wearing a black polo shirt with the “Accessible Fitness” logo and “AF” badge stands against a vibrant background of orange, yellow, purple, and black. Bold black text on a yellow banner reads “POWER BI,” followed by white text “& COLOUR CONTRAST DELIGHT.” Additional elements include the “DATADNA DATA VIZ CHALLENGE” label with a bar chart icon, the social handle “@AccessibleBI,” and a red “SUBSCRIBE” button with a white play icon, inviting viewers to follow the channel. The design highlights inclusive data visualization and accessibility best practices. Click to be directed to the video on YouTube.