#modal {
  /*Position and width*/
  position: fixed;
  width: 30%;
  height: fit-content;
  
  /*NOTE: If you want your modal's position to be absolute or fixed, you should also include:*/
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  
  /*Centering horizintally*/
  margin: auto;

  /*Purely visual stuff*/
  border: 2px solid #ccc;
  border-radius: 3px;
  background-color: ghostwhite;
  text-align:center;
}