<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta http-equiv="X-UA-Compatible" content="IE=edge">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>Document</title>
<style>
.box5{
width: 100%;
height:900px;
/*1*/
/* display: flex;
justify-content: center;
align-items: center; */
/*2*/
/* display: table;
text-align: center; */
/*3*/
/* position: relative; */
}
.box6 {
/*1*/
/*2*/
/* display: table-cell;
vertical-align: middle; */
/*3*/
/* position: absolute;
top:50%;
left:50%;
transform: translate(-50%,-50%); */
}
</style>
</head>
<body>
<div class="box5">
<div class="box6">111</div>
</div>
</body>
</html>
