html, body {
  height: 100%;
  width: 100%;
  margin: 0;
  padding: 0;
  overflow: hidden;
}
.dialog-off-canvas-main-canvas,
.region-content,
.block-system-main-block {
  height: 100%;
}
p {
  margin: 0;
  height: 100%;
}
iframe {
  height: 100%;
  width: 100%;
  border: none;
}