Marc Andreessen, co-founder at Andreessen Horowitz, helped pioneer the early internet by co-authoring Mosaic, a web browser widely credited with popularizing the World Wide Web. Due to a sensitivity to light, he found reading black text on white backgrounds difficult. As a result, early versions of Mosaic adopted a gray background. Although Marc advocated for a true dark mode, the limitations of display technology at the time made this infeasible.