.menu{

  position:absolute;
  top:calc(50% - 75px);
  left:calc(50% - 160px);
  width:300px;
  height:150px;
  display:none;
  padding:10px;
  background-color: #dddddd;
  border: 1px solid black;

}

.inventoryItem{

  width:100px;
  height:100px;
  cursor:pointer;
  padding:5px;
  font-size:25px;
  line-height: calc(100px - 10px);
  background-color:#ffffff;
  border:solid 1px #000000;
  border-radius:5px;

  text-align: center;

  transition: background-color 0.5s;

}

.inventoryItem:hover{

  background-color:#eeeeee;

}

button{

  cursor:pointer;

}