* {
    margin: 0px;
    padding: 0px;
    box-sizing: border-box;
  }
  body {
    height: 100vh;
    display: flex;
  }
  .code-area {
    display: flex;
    flex-direction:column;
    width: 50%;
    border-right:1px solid #555;
  }
  .code-area textarea {
    background-color: #555;
    color: white;
    resize: none;
    outline: none;
    width: 100%;
    height: 33.33%;
    font-size: 18px;
    padding: 10px;
  }
  .preview-area {
    width: 50%;
  }
  .preview-area iframe {
    width: 100%;
    height: 100%;
    border: none;
  }