align table center

  .center {
  
  margin-left: auto;
  margin-right: auto;
} 

table#yourTable {
    position: fixed;
    left: 50%;
    top: 50%;
    margin: -(H/2)px -(W/2)px;
    width: Wpx;
    height: Hpx;
}

<table align="center">