<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title></title>
<style type="text/css">
-sharp1{
width: 600px;
height: 300px;
background-color: greenyellow;
margin:20px auto;
}
</style>
</head>
<body>
<div id="1">
</div>
</body>
</html>
you cannot do id with a string that begins with a number
you can open the right mouse button-> check, or F12, open the developer tool to check for yourself
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