<style>      /*第一种*/         /*main{             width:18em;height:6em;position: absolute;top:50%;left:50%;             margin-left:-9em;margin-top:-3em;background: #631082;             text-align: center;          }*/         /*第二种*/         /*main{             position: absolute;             top:calc(50% - 3em);             left:calc(50% - 9em);             width: 18em;             height:6em;             background: #129074;             color:#fff;         }*/         /*  第三种*/         /*main{             position: absolute;             top:50%;             left:50%;             transform: translate(-50%,-50%);             background: #96770a;         }*/         /*第四种*/         /*main{             width: 18em;             padding: 1em 1.5em;             margin: 50% auto 0;             margin: 50vh auto 0;             transform: translateY(-50%);             background: #823810;         }*/         /*第五种*/         body{             display: flex;             min-height: 100vh;             margin: 0;         }         main{margin:auto;background: #91149c;}         /*第六种 然而并没有居中*/         /*main{             display: flex;             align-items: center;             justify-content: center;             width:18em;             height:10em;             background: #980f26;         }*/
    </style>
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