.ch_child {
  width: 70px;
  height: 70px;
  padding: 7px 6px 7px 7px;
  border-right: 1px solid white;
  border-bottom: 1px solid white;
  position: absolute;
}

.can_set:hover {
	background-color: #e04761;
	animation: glow 3000ms ease-in infinite alternate;
  transition: background 0.4s ease;
}

.boardtop {
  height: 71px;
  border-top: 1px solid white;
  position: absolute;
}

.boardleft {
  width: 71px;
  border-left: 1px solid white;
  position: absolute;
}

.bc, .wc {
    width: 56px;
    height: 56px;
    border-radius: 28px;
    background-color: black;
    box-shadow: 0 2px 3px rgba(0,0,0,0.5);
}

.wc {
    background-color: white;
}

.lastest {
  animation: popChess 0.6s;
  -webkit-animation: popChess 0.6s;
}
@keyframes popChess
{
from   {-webkit-transform: rotateY(90deg);transform: rotateY(90deg);}
to     {-webkit-transform: rotateY(0deg);transform: rotateY(0deg);}
}
@-webkit-keyframes popChess
{
from   {-webkit-transform: rotateY(90deg);}
to     {-webkit-transform: rotateY(0deg);}
}

.hint {
  animation: popHint 0.4s;
  animation-delay: 0.1s;
  animation-iteration-count: 2;  
  -webkit-animation: popHint 0.4s;
  -webkit-animation-delay: 0.1s;
  -webkit-animation-iteration-count: 2;
}
@keyframes popHint
{
0%   {background: #ffa3a3;}
80%  {background: #e04761;}
100% {background: #ffa3a3;}
}
@-webkit-keyframes popHint
{
0%   {background: #ffa3a3;}
80%  {background: #e04761;}
100% {background: #ffa3a3;}
}