simple background colors css code example

Example 1: background color css rgb

body {
  background-color: rgb(255,255,255);
}

Example 2: css transparent background color

div {
 opacity:25% ; 
}

Example 3: background color

//javascript type css:
document.body.style.backgroundColor = "blue";
// or inline css:
<div style="background-color: blue;"></div>