color brightness css code example

Example 1: brightness css

brightness(0%)   /* Completely black */
brightness(0.4)  /* 40% brightness */
brightness(1)    /* No effect */
brightness(200%) /* Double brightness */

Example 2: css hover darken color

.your-css-class:hover {
    background: linear-gradient(rgba(0, 0, 0, 0.25), rgba(0, 0, 0, 0.25));
  }