Design an illustrative banner image for a blog post on the topic of web accessibility. The image should have a light pastel color palette, symbolically encapsulating the theme of evolution and progress, represented by a spiral shaped road infinitely extending into the horizon, symbolizing the journey of learning and staying informed. Alongside the spiral road, some digital icons such as a mouse cursor and keyboard should be hovering, representing web elements. Sprinkled around should be people of various genders and descents interacting with these web elements, demonstrating community involvement. This should collectively signify the constant evolution of web accessibility standards and the shared learning experience.