how to set body background image in css code example

Example 1: background image css

.wrapper {
    background: url('./images/homeBg.png') no-repeat;
    background-size: 100vw; 
    float: left;
    height: 100vw;
    width: 100vw;
}

Example 2: ho to add background image in css

body {
  background-image: url("img_tree.gif"), url("paper.gif");

    background-color: #cccccc;
}