* {
  box-sizing: border-box;
}
body {
  margin: 0;
  padding: 0;
  font: normal normal normal 1rem/1.6 Nunito Sans, Helvetica, Arial, sans-serif;
  background-color: #f5f5f5;
  color: #222;
}
.app {
  padding: 15px;
}
.app-preview-text {
  text-transform: uppercase;
}
.app-control input {
  padding: 5px 10px;
}
.app-control-item {
  display: block;
  margin-bottom: 10px;
}
.app-undo-redo button {
  padding: 5px 10px;
  margin-right: 10px;
}