The hex color #5ececf is a light color. The web-safe version is Hex
#66CCCC. A complementary color is
#A13130. The grayscale version is
#A9A9A9. A 20% lighter version of the original color is
#91FFFF, and Hex
#2B9B9C is the 20% darker color. If the color is saturated by 10%, you get
#57D2D3. If the color is desaturated by 10%, the color
#66CACB is obtained.