variable color css code example

Example 1: css variable

:root {
  --main-bg-color: pink;
}
body {
  background-color: var(--main-bg-color);
}

Example 2: variables css

:root {
    --main-bg-color: brown;
  }
  
.uno {
    color: white;
    background-color: var(--main-bg-color);
    margin: 10px;
    width: 50px;
    height: 50px;
    display: inline-block;
}