#container-letters{
  margin:0 auto;
  z-index:1;
  width:100%;
  height:100%;
  overflow:hidden;
  clear:both;
  display: -webkit-flex;
  -webkit-flex-wrap: wrap;
  display: inherit;
  flex-wrap: wrap;
  justify-content: center;
  align-items: center;
}

#palabra {
  position:relative;
  display: block;
}

.highlight {
  border-top: 2px ;
  border-right: 2px;
  border-left: 2px;
  border-color: transparent;
  border-style:dotted;
}

.boxin {
  width:9.5vw;
  height:9.5vw;
  border-bottom: 3px solid black;
  color:black;
  display: inline-block;
}

.center-letters{
  position: relative;
  display: block;
}


#container-abc{
  display: inline-flex;
  flex-wrap: wrap;
  justify-content: center;
}

#hueco-pista{
  letter-spacing: 2px;
}

.letterSpace{
  border-bottom: 0;
}


#acierto {
  text-align: center;
  min-height: 24px;
  transform: scale(0);
}

@keyframes zoomInOut {
  0% { transform: scale(0); }
  50% { transform: scale(1); }
  70% { transform: scale(1); }
  100% { transform: scale(0); }
}

.letra:disabled {
  color:rgba(255, 0, 0, 0.5);
}

.fade-in {
  opacity: 1 !important;
}