creating variables on css code example

Example 1: css set variable

:root {
  --main-bg-color: coral;
}

#div1 {
  background-color: var(--main-bg-color);
}

#div2 {
  background-color: var(--main-bg-color);
}

Example 2: how to use variables in css

:root {
  --clr-primary-1: hsl(205, 86%, 17%);
}

.container{
  background-color: var(--clr-primary-3);
}