浏览器兼容直接用

display: flex;
display: -webkit-box;
display: -webkit-flex;
display: -ms-flexbox;

flex-direction: column;
-webkit-box-orient: vertical;
-webkit-flex-direction: column;
-ms-flex-direction: column;

flex: 1;
-webkit-box-flex: 1;
-webkit-flex: 1;
-ms-flex: 1;

align-items: center;
-webkit-box-align: center;
-webkit-align-items: center;
-ms-flex-align: center;

justify-content: center;
-webkit-box-pack: center;
-webkit-justify-content: center;
-ms-flex-pack: center;

justify-content: space-between;
-webkit-box-pack: justify;
-webkit-justify-content: space-between;
-ms-flex-pack: justify;

-webkit-box-pack: end;
-ms-flex-pack: end;
-webkit-justify-content: flex-end;
justify-content: flex-end;

align-items:center;
-webkit-align-items:center;
box-align:center;
-moz-box-align:center;
-webkit-box-align:center;

transform: translateX(-50%);
-ms-transform: translateX(-50%);
-moz-transform: translateX(-50%);
-webkit-transform: translateX(-50%);
-o-transform: translateX(-50%)