#grid {
  display: grid;
  width: 100vw;
  height: 100vh;
  box-sizing: border-box;
}

body {
  background-color: black;
}

.cell {
    padding: 0;
    margin: 0;
    box-sizing: border-box;
    border: 1px solid #111111;
    background: #000000;
}
.cell.alive { background: #e6f7ff; }