body {
  margin: 0;
  font-family: Arial, sans-serif;
  display: flex;
  height: 100vh;
}

#left {
  width: 360px;
  padding: 20px;
  border-right: 1px solid #ccc;
  box-sizing: border-box;
}

#right {
  flex: 1;
}

iframe {
  width: 100%;
  height: 100%;
  border: 0;
}

label {
  display: block;
  margin-top: 20px;
  margin-bottom: 6px;
}

input {
  width: 100%;
  padding: 10px;
  box-sizing: border-box;
  font-size: 16px;
}

button {
  margin-top: 12px;
  width: 100%;
  padding: 12px;
  font-size: 16px;
  cursor: pointer;
}

pre {
  background: #f5f5f5;
  padding: 12px;
  height: 250px;
  overflow: auto;
  white-space: pre-wrap;
}