.blue-square-container {
  text-align: center;
}

.blue-square {
    background-color: #0074D9;
    width: 100px;
    height: 100px;
    display: inline-block;
}

#drag-drop-area {
  width: 600px;
  height: 400px;
margin: 40px auto;
}

body {
  background-color: #282F37;
}