html, body {
  margin: 0;
  padding: 0;
  height:100%;
}

iframe {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  border: 0;
}

    .toast {
      visibility: hidden;
      min-width: 200px;
      background-color: #333;
      color: #fff;
      text-align: center;
      border-radius: 8px;
      padding: 12px;
      position: fixed;
      bottom: 30px;
      left: 50%;
      transform: translateX(-50%);
      z-index: 9999;
      font-family: sans-serif;
      font-size: 16px;
      opacity: 0;
      transition: opacity 0.5s ease-in-out;
    }

    #toast.show {
      visibility: visible;
      opacity: 1;
    }