Comment rendre un calque solide transparent dans After Effects

In the world of motion graphics and visual effects, After Effects has established itself as a powerful tool that empowers artists to bring their wildest imaginations to life. One such skill that every After Effects user should have is the ability to create a solid transparent.
A solid is essentially a colored rectangle that can serve as a background or a foreground element in your composition. However, sometimes you might want to add a touch of magic to your visuals by making a solid transparent to allow the layers beneath it to shine through. Transparent solids are indispensable for creating stunning effects such as ghostly apparitions, futuristic interfaces, and elegant overlays.