#gamebox {
  align-items: center;
  height: 400px;
  width: 750px;
  margin: 0;
  background: #000;
  position: relative;
}

#timer{
    height: 25px;
    width: 100%;
    text-align: center;
    margin: 10px 0px 0px 0px;
    font-size: 16px;
    position: relative;
}

#timer span#plta{
  position: absolute;
  left: 0px;
  top: 2px;
  color: #aaa;
}

#timer span#pltb{
  position: absolute;
  left: 390px;
  top: 2px;
  color: #aaa;
}

#timer span#tdesc{
  position: absolute;
  left: 240px;
  top: 2px;
  color: #fff;
}

#timer span#time{
  position: absolute;
  left: 320px;
  top: 0px;
  color: red;
  font-weight: bold;
  font-size: 18px;
}

#timer span#cdesc{
  position: absolute;
  left: 620px;
  top: 2px;
  color: #fff;
}

#timer span#check{
  position: absolute;
  left: 720px;
  top: 0px;
  color: red;
  font-weight: bold;
  font-size: 18px;
}

.game-container {
  display: flex;
  gap: 30px;
}

.image-grid {
  display: grid;
  grid-template-columns: repeat(6, 60px);
  grid-template-rows: repeat(6, 60px);
  gap: 0px;
}

.block {
  width: 56px;
  height: 56px;
  background-color: grey;
  cursor: pointer;
}

.changed {
  -webkit-box-shadow:inset 0px 0px 0px 12px #000;
  -moz-box-shadow:inset 0px 0px 0px 12px #000;
  box-shadow:inset 0px 0px 0px 12px #000;
}

.hidden{
  display: none;
}

#overlay{
  position: absolute;
  top: 0;
  height: 100%;
  width: 100%;
  background-color: rgba(0,0,0,0.8); 
  z-index: 2;
}

#overlayMessage{
  margin-top: 130px;
  text-align: center;
  font-size: 26px;
  font-weight: bold;
  color: red;
}

#restartButton{
  margin: 20px 0px 0px 280px;
  font-size: 20px;
}