#input {
  margin-left: auto;
  margin-right: auto;
  max-width: 500px;
}

#output {
  margin-left: auto;
  margin-right: auto;
  max-width: 1000px;
}

#container,
#output,
#outputContent {
  display: flex;
  flex-direction: column;
  align-items: center;
}

.plain-btn {
  background: none;
  color: inherit;
  border: none;
  padding: 0;
  font: inherit;
  cursor: pointer;
}