how to center html

1.center {
2  display: block;
3  margin-left: auto;
4  margin-right: auto;
5}

1<style>
2  .el-parent {
3    display: flex;
4    align-items: center;		/* vertical align */
5    justify-content: center;	/* horizontal align */
6    text-align: center;			/* center align text */
7  }
8</style>
9    

1body {
2  display:flex; flex-direction:column; justify-content:center;
3  min-height:100vh;
4}

1<center>
2	<p>This is centered</p>
3</center>

1text-align: center;

1<tag class="" align='center'></tag>