iframe {
  height: 100vh;
  margin: 0;
  box-sizing: border-box;
  border: 0;
  padding: 0;
}
body {
  padding: 0;
  margin: 0;
  overflow: hidden;
  font-family: ui-sans-serif,system-ui,sans-serif,Apple Color Emoji,Segoe UI Emoji,Segoe UI Symbol,Noto Color Emoji;
}

a {
  position: absolute;
  bottom: 0;
  right: 0;
  transform: translate(-50%, -50%);
  padding: 10px;
  border-radius: 100%;
  text-decoration: none;
  font-weight: bold;
}

.container {
  width: 800px;
  display: flex;
  position: absolute;
  margin: auto;
  height: 100%;
  top: 0;
  left: 50%;
  transform: translateX(-50%);
}