body {
  padding: 0;
  margin: 0;
}

.parent {
  color: white;
  display: flex;
  flex-direction: column;
  height: 100vh;
  align-items: center;
  justify-content: center;
  gap: 10px;
  background-size: cover;
}

#grid-container {
  display: flex;
  flex-wrap: wrap;
  width: 440px;
}

.cell {
  width: 20px;
  height: 20px;
  background-color: black;
  border: 1px solid white;
}

.cell.alive {
  background-color: #2aa146;
}

.buttons {
  display: flex;
  justify-content: center;
  gap: 10px;
}

.video {
  position: fixed;
  width: 100%;
  min-height: 100%;
  object-fit: cover;
  z-index: -1;
}