The flag of Serbia has three horizontal stripes of equal width, with the following colors and hex color codes:

1. Top stripe: Red (#C6363C)
2. Middle stripe: Blue (#0C4076)
3. Bottom stripe: White (#FFFFFF)

The aspect ratio of the flag is 2:3.

On the left side of the blue stripe, there is a coat of arms that is centered vertically. The coat of arms does not extend into the red or white stripes.

The geometric properties and measurements of the coat of arms are more complex and may vary slightly depending on the specific rendition.