#div00 {
   display: table;
   text-align: center;
   vertical-align: middle;
   margin-left: auto;
   margin-right: auto;
   margin-top: auto;
   margin-bottom: auto;
}

#div01 {
   display: table-cell;
   width: 90%;
   height: 90%;
   border: 1px solid black;
   line-height: 90%;
   font-size: 36px;
   text-align: center;
   vertical-align: middle;
   font-size: 35vw; 
}