/*
  This css is only for this example
*/

body {
  text-align: center;
}

h1 {
  text-align: center;
}

textarea {
  width: 100%;
  min-height: 100px;
}

.container {
  width: 80%;
  margin: 0 auto;
  text-align: left;
}

  div.mdhtmlform-html {
    width: 100%;
    padding: 12px;
    border: 1px #afafaf solid;
  }