* {
  box-sizing: border-box;
  -moz-box-sizing: border-box;
  -webkit-box-sizing: border-box;
}
html,
body {
  margin: 0;
  padding: 0;
  height: 100%;
}
#json {
  width: 50%;
  height: 100%;
  float: left;
  padding: 0;
}
#json p {
  font-family: Verdana;
  margin: 20px;
}
#demo {
  width: 50%;
  height: 100%;
  float: right;
  padding: 0 10px 0 20px;
}
#demo p {
  display: inline-block;
  margin: 20px 0 10px;
  font-size: 10pt;
  font-family: Verdana;
}
#demo textarea {
  display: block;
  width: 100%;
  height: 40%;
  float: right;
  resize: none;
}
#demo input {
  margin: 10px 0;
  float: right;
}