ol ul{list-style-type:none; margin: 0 0 0 1em;padding: 0;}
li{margin-bottom: 5px;}

@media screen and (min-width:640px){
 /* for PC*/
 /* table要素サイズ・位置 */
 table.tbbook{
  width:800px;
  margin-left: auto;
  margin-right: auto;  
 }

 table.tbbook td{width:400px ;}
}

@media screen and (max-width:640px){
/* for smart phone or Tablet device*/

 /* table要素サイズ・位置 */
 table.tbbook{
  width:90vw;
  max-width:800px;
  margin-left: auto;
  margin-right: auto;  
 }

 table.tbbook td{width:45vw; max-width:400px ;}
}