1 <!DOCTYPE html>

 2 <html>

 3 <head>

 4 <meta charset="utf-8">

 5 <title>图片垂直水平居中</title>

 6 <style>

 7 .flex-container {

 8 display: -webkit-flex;

 9 display: flex;

10 width: 400px;

11 height: 250px;

12 background-color: lightgrey;

13 }

14

15 .flex-item {

16 background-color: cornflowerblue;

17 width: 75px;

18 height: 75px;

19 margin: auto;

20 }

21 </style>

22 </head>

23 <body>

24

25 <div class="flex-container">

26 <div class="flex-item">Perfect centering!</div>

27 </div>

28

29 </body>

30 </html>

 <!DOCTYPE html>

 <html>

     <head>

         <meta charset="utf-8" />

         <meta name="viewport" content="width=device-width, initial-scale=1">

         <title>图片居中</title>

         <style type="text/css">

             .loading {

                 width: 100%;

                 height: 100%;

                 position: fixed;

                 top: 0;

                 left: 0;

                 background: #eee;

             }

             .loading img{

                 position: absolute;

22                 top: 0;

23                 left: 0;

24                 bottom: 0;

25                 right: 0;

26                 margin: auto;

             }

         </style>

     </head>

     <body>

         <div class="loading">

             <img src="img/Flower.gif" >

         </div>

         </body>

 </html>