* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

body {
  background: #293462;
  width: 100%;
  height: 100vh;
  display: grid;
  place-content: center;
}

#container {
  display: flex;
  flex-wrap: wrap;
  max-width: 400px;
}

.square {
  margin: 2px;
  width: 16px;
  height: 16px;
  background-color: #c3639d1d;
  box-shadow: 0 0 2px #000;
  transition: 2s ease;
}

.square:hover {
  transition-duration: 0s;
}