html, body {
  margin: 0;
  padding: 0;
  font-family: Arial, sans-serif;
  background: url('show-bg.jpg') no-repeat center center;
  background-size: contain;
  background-repeat: no-repeat;
  background-attachment: scroll;
  height: 100%;
  width: 100%;
  overflow-x: hidden;
}

.iframe-wrapper {
  display: flex;
  justify-content: center;
  margin-top: 340px;
  padding-bottom: 40px;
  position: relative;
  z-index: 1;
}

.responsive-iframe {
  width: 90%;
  max-width: 960px;
  height: 600px;
  border: 2px solid #ccc;
  background-color: white;
}