Flexbox is a layout model that makes it easy to align and distribute elements within a container.
Example:
<!DOCTYPE html>
<html>
<head>
<style>
.container {
display: flex;
justify-content: center;
align-items: center;
height: 100vh;
background-color: lightgray;
}
.box {
width: 100px;
height: 100px;
background-color: blue;
color: white;
text-align: center;
line-height: 100px;
}
</style>
</head>
<body>
<div class="container">
<div class="box">Flex</div>
</div>
</body>
</html>