* {
  box-sizing: border-box;
}

body {
  background-color: #111;
  display: flex;
  align-items: center;
  justify-content: center;
  height: 100vh;
  overflow: hidden;
  margin: 0;
}

#board {
  width: 480px;
  display: flex;
  flex-wrap: wrap;
}

.cell {
  width: 20px;
  height: 20px;
  margin: 2px;
  background-color: #424242;
  box-shadow: 0 0 2px #0000;
  transition: background-color 2s ease, box-shadow 0.5s ease-out, transform 1s ease-in-out;
}

.cell:hover{
  transition-duration: 0s;
  transform: scale(1.15);
}