body {
  background-color: black;
}

.modal {
  width: 70%;
  height: 33vh;
  padding: 15px;
  margin: auto;
  margin-top: 25vh;
  border: 1px solid black;
  border-radius: 20px;
  font-size: 1.3rem;
  background-color: rgba(255, 100, 100, .5)
}

input {
  margin: 20px;
}

.submit-btn {
  display: block;
  border-radius: 4px;
  font-size: 1.5rem;
  margin: auto;
  margin-top: 30px;
}

.gameboard {
  width: 95%;
  height: 95vh;
  background-color: white;
  border-radius: 30px;
  padding: 20px;
}

.column {
  float: left;
}

.cell {
  box-sizing: border-box;
}

.alive {
  background-color: red;
}

.dead {
  background-color: white;
}