body {
  display: flex;
  align-items: center;
  justify-content: center;
  height: 100vh;
  }
.chessBoard {
  width:80vw;
  height: 80vw;
  margin: 0 auto;
  display: flex;
  flex-wrap: wrap;
}
.square {
  width:12.5%;
  height: 12.5%;
  float: left;
  display: flex;
  justify-content: center;
  align-items: center;
  position: relative;
}
.white {
  background-color: #f0d9b5;
}
.black {
  background-color: #b58863;
}
.coordinate {
  height:auto;
  display:flex;
  bottom: 4%;
  left:4%;
  position: absolute;
  font-size: 12px;
  font-weight: bold;
  font-family: Verdana, Geneva, Tahoma, sans-serif;
}
.rank {
  top:4%;
  right:4%;
  left:auto;
}
.whiteText {
  color:#f0d9b5;
}
.blackText {
  color:#b58863;
}
.piece {
  width:100%;
  z-index: 1;
  cursor: pointer;
}
.piece img {
  max-width: 100%;
  width:100%;
  height: auto;
}

#alert {
  position: fixed;
  top:50%;
  left:50%;
  transform: translate(-50%,-50%);
  color:rgb(0, 176, 67);
  width:44vw;
  text-align: center;
  align-content: center;
  justify-content: center;
  font-size:xxx-large;
  font-weight: bold;
  z-index: 1000;
  display: none;

}
    

@media (min-width:600px) {
  .chessBoard {
      width:600px;
      height: 600px;
  }
}
@media (max-width:600px) {
  .coordinate {
    font-size: 8px;
  }
}

.promotionOption{
  border-radius: 50%;
  background-color: darkgray;
  transition: transform 0.2s;
  position: absolute;
  z-index: 1000;
}
.promotionOption:hover {
  cursor: pointer;
  border-radius: 0%;
  background-color: rgb(115,194,132);
  width: 100%;
}
.promotionOption img {
  max-width: 100%;
  width: 100%;
  height: auto;
}