<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>Title</title>
<style>
* {
padding: 0;
margin: 0;
}
html,body {
height: 100%;
width: 100%;
}
.parent {
width: 40%;
height: 30%;
background: bisque;
position: relative;
margin: 2%;
}
.child {
height: 30%;
width: 30%;
position: absolute;
top: 50%;
left: 50%;
transform: translate(-50%, -50%);
background: red;
}
.parent1 {
width: 40%;
height: 30%;
background: bisque;
position: relative;
margin: 2%;
}
.child1 {
height: 30%;
width: 30%;
background: red;
position: absolute;
left: 0;
right: 0;
bottom: 0;
top: 0;
margin: auto;
}
.parent3 {
width: 40%;
height: 30%;
background: bisque;
display: flex;
flex-flow: row wrap;
align-items: center;
justify-content: center;
margin: 2%;
}
.child3 {
height: 30%;
width: 30%;
background: red;
}
</style>
</head>
<body>
<div class='parent'>
<div class='child'>cccc</div>
</div>
<div class='parent1'>
<div class='child1'>ddddd</div>
</div>
<div class='parent3'>
<div class='child3'>eeee</div>
</div>
</body>
</html>
