css background color

1body {
2  background-color: green;
3}

1body {
2  background-color: rgb(255,255,255);
3}

1html,body {
2  background-color: red;
3}

1div {
2 opacity:25% ; 
3}

1/* Use the following code: */
2html {background-color: #fefefe;} 
3/* You can change the hexedecimal code to RGB, RGBA, name & more colors!*/

1body {background-color: coral;}