style.css

* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, 'Open Sans', 'Helvetica Neue', sans-serif;
  font-size: 16px;
  background-color: #fff;
  overflow: hidden;
}

h1 {
  color: #323330;
}

.container {
  height: 100vh;
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  margin: 20px;

}

.drop-targets {
  display: flex;
  flex-direction: row;
  justify-content: space-around;
  align-items: center;

  margin: 20px 0;
}

.box {
  height: 150px;
  width: 150px;
  border: solid 3px #ccc;
  margin: 10px;

  /* align items in the box */
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;

}


.drag-over {
  border: dashed 3px red;
}

.item {
  height: 75px;
  width: 75px;
  background-color: #F0DB4F;

}

.hide {
  display: none;
}