Html/css 列表项区分列表首尾

列表项，有时需要判断列表首尾，来筛选设置样式

Html/css 列表项区分列表首尾

如上图，三个项有间隔，怎么保证设置了列表项之间的距离后，整体还水平居中显示呢？

.item:not(:first-child) {
　　margin-left: 20px;
}

 1 <!DOCTYPE html>
 2 <html>
 3 <head>    
 4 <meta charset="UTF-8">    
 5 <title>Document</title>    
 6 <style type="text/css">
 7 .container {
 8   width:600px;
 9   height:300px;
10   background: rgba(4,0,255,0.50);
11 }
12 .list-parentOuter {
13   float: left;
14   margin-left: 50%;
15 }
16 .list-parentInner {
17   position: relative;
18   right: 50%;
19   display: flex;
20   flex-direction: row;
21   justify-items: center;
22   margin-top:50px;
23 }
24 .item{
25   height: 120px;
26   width: 120px;
27   border: 1px solid #04D18D;
28   background-color:#04D18D;
29   border-radius: 60px;
30   color:#ffffff;
31   text-align:center;
32   line-height:120px;
33   margin: 0px auto;
34 }
35 .item:not(:first-child) {
36   margin-left: 20px;
37 }
38 </style>
39 
40 </head>
41 <body>   
42 <body>
43   <div class="container">
44     <div class="list-parentOuter">
45       <div class="list-parentInner">
46         <div class="item">AAA</div>
47         <div class="item">BBB</div>
48         <div class="item">CCC</div>
49       </div>
50     </div>
51   </div>
52 </body>　
53 </body>
54 </html>

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