<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>Title</title>
<style>
body{
display: flex;
align-items: center;
justify-content: center;
height: 100vh;
}
.aa{
display: flex;
align-items: center;
justify-content: center;
800px;
border: 1px;
}
.aa>div{
flex: 0 0 20%;
margin-left: 5px;
height: 30px;
background: red;
border: 1px solid yellow;
}
</style>
</head>
<body>
<div class="aa">
<div></div>
<div></div>
<div></div>
<div></div>
<div></div>
</div>
</body>
</html>