body{
  background-color: green;

  }
.box{
  width: 200px;
  height: 200px;
  border-style: solid;
  border-width: 10px;
  border-color: black;
  font-size: 200px;
  text-align: center;
  user-select: none;
  }
#board{
  width: 670px;
  display: flex;
  flex-wrap: wrap;
  
  }
.box:hover{
    border-style: dashed;
    
    
    }
#backbutton{
  width: 150px;
  height: 120px;
  font-size: 45px;
  margin-top: 20px;
  }