javascript - Add CSS class to change style of HTML element -

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@charset "utf-8";    html, body {  	margin: 0px;  	font-family: helvetica, sans-serif;  	min-height: 100%;  	height: 100%;  }    .center-container {  	display: flex;  	align-items: center;  	justify-content: center;  	height: 100%;  	/*height: 500px;*/  }    .main-container {  	/*height: 100%;*/  	  }      	  .darktitle {  	color: #000000;  	background: grey;  	font-size: 25px;  }    .titlebar {  	text-align: center;   	color: #ff0000;  	background: blue;  	font-size: 40px;  }        button {  	padding: 00px;  	font-weight: bold;  	  	font-size:1em;  	font  	  	color: #000000;  	height: 40px;  	width: 200px;  }
<!doctype html>  <html lang="de">  <head>  	<link href="styles/styles.css" rel="stylesheet"/>  	<meta charset="utf-8">    </head>  	<body>  		<div class="main-container">  			<h1 id="titlebar" class="titlebar"> titlebar</h1>  			<div class="center-container" >  					<button id="button1">button1</button>  					<button id="button2">button2</button>  					<button id="button3">button3</button>  			</div>  		</div>  		<script>  			var titlebar = document.queryselector('h1#titlebar');  			var button1 = document.queryselector('#button1');  			var button2 = document.queryselector('#button2');  			var button3 = document.queryselector('#button3');    			button1.addeventlistener('click', function() {  				titlebar.innerhtml = 'button1';    				var result = titlebar.classlist.contains('darktitle');  				console.log(result);  				titlebar.classlist.add('darktitle');  				var result = titlebar.classlist.contains('darktitle');  				console.log(result);    			});  		</script>  	</body>  </html>

hey earthlings,

i started learning html , css. i'm dealing style classes. created simple example. want reach is, titlebar changes font color, font-size , background color if button1 clicked.

initially titlebar has appended titlebar-class, after button1 clicked darktitle-class should added , overwrite attributes. in configuration doesn't happen. if change order of .darktitle , .titlebar class in css file works. wonder why.

the css styles should on same priority level, expect laterly assigned overwrite attributes.

tnx

you can use !important override styles this

.darktitle {     color: #000000!important;     background: grey!important;     font-size: 25px!important; }

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