/* Set editor dimensions */
  #editor {
    height: 400px;
    width: 50%;
}

/* Stretch editor to fit inside its containing div */
.cm-editor {
    height: 100%;
    width: 100%;
}
 /* header */
 header {
    background-color: burlywood;
}
.container {
  display: flex;
}

.item {
  flex-grow: 1;
  height: 100px;
}

.item + .item {
  margin-left: 2%;
}