* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}
body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Roboto', 'Oxygen',
    'Ubuntu', 'Cantarell', 'Fira Sans', 'Droid Sans', 'Helvetica Neue',
    sans-serif;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

code {
  font-family: source-code-pro, Menlo, Monaco, Consolas, 'Courier New',
    monospace;
}

.container {
  align-items: center;
  display: flex;
  height: 100vh;
  justify-content: center;
  width: 100vw;
}

.row {
  height: 30px;
}

.cell {
  border: 1px solid black;
  border-right: none;
  border-bottom: none;
  display: inline-block;
  height: 30px;
  width: 30px;
}

.row:last-child .cell {
  border-bottom: 1px solid black;
}

.cell:last-child {
  border-right: 1px solid black;
}

.cell.alive {
  background: black;
}