Create a background image with a deep blue hue, representing a misty and mysteri

Create a background image with a deep blue hue, representing a misty and mysterious environment. The fog should be ethereal, with graduations of blue ranging from lighter to darker, creating a sense of depth and serenity. The fog should flow gently through the background, with subtle transitions between the different shades, evoking a sense of calm and tranquility. Additional Specifications: Aspect Ratio: 16:9 Texture: Smooth and flowing, with thick fog in some areas and more dispersed in others, creating a sense of movement. Lighting: Smooth and cool, as if the background were bathed in a diffused light that penetrates the fog, reinforcing the calm and relaxing atmosphere.