body {
  text-align: left;
  font-size: 1.5em;
  background: #f9f9f9;
}

input {
  font-size: 1.3em;
  margin-bottom: 1em;
  border: 1px solid #000;
  padding: 3px;
  border-radius: 10px;
}

h1 {
  text-align: left;
  margin: 1em;
  font-size: 1.5em;
}
.container {
  overflow: hidden;
  position: relative;
  width: 100%;
  height: 0;
  padding-bottom: 56%;
}

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