* {
  box-sizing: border-box;
}

body {
  margin: 0;
  background: #535389;
  color: #fff;
  font-family: Arial, Helvetica, sans-serif;
}

#game {
  padding-top: 20px;
  font-size: 30px;
  width: 320px;
  margin: auto;
}

.main {
  width: 320px;
  height: 620px;
  margin: 20px auto 0;
  border: 10px solid silver;
  font-size: 0;
}

.cell {
  width: 30px;
  height: 30px;
  border: 1px solid #a2a289;
  display: inline-block;
}

.movingCell {
  background-color: #c0c490;
}

.fixedCell {
  background-color: #b3bb3b;
}

#next-tetro {
  position: absolute;
  top: 200px;
  right: 450px;
  font-size: 0;
}

#game-over {
  font-size: 100px;
  color: darkred;
  text-align: center;
  display:none;
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
}