body {
  margin: 0;
  padding: 0;
  color: #333;
  background-color: #fbfbfb;
  height: 100%;
}

header {
  height: 40px;
}

textarea {
  resize: none;
}

#main {
  display: block;
}

.containers {
  display: flex;
  height: calc(100vh - 120px);
}

.container {
  flex-basis: 50%;
  padding: 5px;
  display: flex;
  flex-direction: column;
  height: 100%;
  box-sizing: border-box;
}

#input {
  margin-top: 5px;
  padding: 0.6em;
  border: 1px solid #ccc;
  overflow: auto;
  flex-grow: 1;
  flex-shrink: 1;
}

#output {
  /*
  display: flex;
  */
  margin-top: 5px;
  padding: 0.6em;
  border: 1px solid #ccc;
  overflow: auto;
  flex-grow: 1;
  flex-shrink: 1;
}