background cover w3schools code example
Example 1: background image size css
#example1 {
background: url(mountain.jpg);
background-repeat: no-repeat;
background-size: auto;
}
#example2 {
background: url(mountain.jpg);
background-repeat: no-repeat;
background-size: 300px 100px;
}
Example 2: how to set a full size background image in html
<head>
<style>
#example1{
border: 2px solid black;
padding: 100px;
background: url(mountain.jpg);
background-repeat: no-repeat;
background-size: 100% 100%;
}
</style>
</head>
<body>
<div id="example1">
</div>
</body>