RESPONSIVE rem,em vw and vh
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<meta http-equiv="X-UA-Compatible" content="ie=edge">
<title>Size units</title>
<style>
html{
font-size: 25px;
}
.container{
width:400px;
/* height: 344px; */
height: 100vh;
width: 100vw;
font-size: 10px;
border :2px solid red;
}
h1{
text-align: center;
}
#first{
/* font-size: 3em;
padding: 3em; */
}
#second{
/* font-size: 3rem;
padding: 3rem; */
}
</style>
</head>
<body>
<div class="container">
<h1 id="first">This is first heading</h1>
<h1 id="second">This is second heading</h1>
<h1 id="third">This is third heading</h1>
</div>
</body>
</html>
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