摘要：非常簡(jiǎn)潔易懂，排名不分先后，開(kāi)整第一種常見(jiàn)的第二種第三種通過(guò)的第四種標(biāo)配標(biāo)配標(biāo)配三個(gè)標(biāo)配一起使用才能發(fā)揮作用第五種，不能大量使用，會(huì)影響性能第六種第七種第八種第九種第十種第十一

非常簡(jiǎn)潔易懂，排名不分先后，開(kāi)整！
HTML:

.main {
            position: relative;
            width: 800px;
            height: 500px;
            background-color: lightblue;
        }
        
        .content {
            position: absolute;
            width: 300px;
            height: 200px;
            top: 50%;
            left: 50%;
            margin-left: -150px;
            margin-top: -100px;
            background: lightpink;
        }

.main {
            position: relative;
            width: 800px;
            height: 500px;
            background-color: lightblue;
        }
        
        .content {
            position: absolute;
            width: 300px;
            height: 200px;
            top: 50%;
            left: 50%;
            transform: translate(-50%, -50%);
            background: lightpink;
        }

.main {
            position: relative;
            width: 800px;
            height: 500px;
            background-color: lightblue;
        }
        
        .content {
            position: absolute;
            width: 300px;
            height: 200px;
            top: 0;
            left: 0;
            right: 0;
            bottom: 0;
            background: lightpink;
            margin: auto;
        }

.main {
            width: 800px;
            height: 500px;
            background: lightblue;
            display: table-cell;
            /*標(biāo)配*/
            vertical-align: middle;
            /*標(biāo)配*/
        }
        
        .content {
            width: 300px;
            height: 200px;
            background: lightpink;
            margin: auto;
            /*標(biāo)配*/
        }
        /*三個(gè)標(biāo)配一起使用才能發(fā)揮作用*/

 .main {
            width: 800px;
            height: 500px;
            background-color: lightblue;
        }
        
        .content {
            width: 300px;
            height: 70px;
            background: lightpink;
            margin: auto;
            position: relative;
            top: calc((100% - 70px)/2);
        }

 .main {
            display: flex;
            width: 800px;
            height: 500px;
            background-color: lightblue;
            justify-content: center;
            align-items: center;
        }
        
        .content {
            width: 300px;
            height: 200px;
            background: lightpink;
        }

.main {
            display: flex;
            width: 800px;
            height: 500px;
            background-color: lightblue;
            justify-content: center;
            text-align: center;
        }
        
        .content {
            width: 300px;
            height: 200px;
            background: lightpink;
            align-self: center;
        }

.main {
            display: flex;
            width: 800px;
            height: 500px;
            background-color: lightblue;
        }
        
        .content {
            width: 300px;
            height: 200px;
            background: lightpink;
            margin: auto;
        }

.main {
            display: grid;
            width: 800px;
            height: 500px;
            background-color: lightblue;
            justify-content: center;
            align-content: center;
        }
        
        .content {
            width: 300px;
            height: 200px;
            background: lightpink;
        }

.main {
            display: grid;
            width: 800px;
            height: 500px;
            background-color: lightblue;
            justify-content: center;
            align-items: center;
        }
        
        .content {
            width: 300px;
            height: 200px;
            background: lightpink;
        }

.main {
            display: grid;
            width: 800px;
            height: 500px;
            background-color: lightblue;
            justify-content: center;
        }
        
        .content {
            width: 300px;
            height: 200px;
            background: lightpink;
            align-self: center;
        }

.main {
            width: 800px;
            height: 500px;
            display: grid;
            background: lightblue;
        }
        
        .content {
            width: 300px;
            height: 200px;
            margin: auto;
            background: lightpink;
        }

  .main {
            width: 800px;
            height: 500px;
            display: grid;
            place-content: center;
            /*這是justy-content與align-items的結(jié)合寫法*/
            background-color: lightblue;
        }
        
        .content {
            width: 300px;
            height: 200px;
            background: lightpink;
        }

 .main {
            display: grid;
            width: 800px;
            height: 500px;
            background-color: lightblue;
            place-items: center;
        }
        
        .content {
            width: 300px;
            height: 200px;
            background: lightpink;
        }

.main {
            margin: auto;
            width: 800px;
            height: 500px;
            background-color: lightblue;
            display: grid;
            grid-template-columns: 1fr auto 1fr;
            grid-template-rows: 1fr auto 1fr;
            grid-template-areas: ". . ." ". amos ." ". . .";
        }
        
        .content {
            width: 300px;
            height: 200px;
            background: lightpink;
            grid-area: amos;
        }

好啦，十五種方法Get！