body
{
  font-family: Arial, sans-serif;
}

#mainDiv
{
  width: 800px;
  height: 460px;
  border-radius: 2em;
  text-align: center;
  margin: 0 auto;  /* TB   LR  */
  border: 3px solid gray;
}

#MissingWarning
{
  display: none;
}

#firstParagraph
{
  display: block !important;
}