/*Might not need any of this using frameset/frame*/

html, body {
  height: 100%;
  margin: 0 auto;
  /** overflow: hidden; **/
}

.piece {
  flex: 100%;
}

iframe {
  height: 100%;
  width: 100%;

  border: 0;
  border-width: 0;
  border-style: none;
}

frameset {
  width: 100%;
  height: 100%;
}

html, #main {
  height: 100%;
}

#main {
  display: flex;
  height: 100%;
  flex-direction: column;
  /** overflow: hidden; **/
  margin: 0 auto;
}