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Wenwei Lu
10,897 Pointsbackground colour
why?
const warning = document.getElementById("warning");
let button = document.getElementById("makeItRed");
button.addEventListener('click',() =>{
warning.style.background-color="red";
} );
<!DOCTYPE html>
<html>
<head>
<title>Adding an Event Listener</title>
</head>
<link rel="stylesheet" href="style.css" />
<body>
<div id="warning">
Warning: My background should be red!
</div>
<button id="makeItRed">Make It Red!</button>
<script src="app.js"></script>
</body>
</html>
