style.css

body {
  background-color: rgb(37, 37, 53);
  font-family: monospace;
  font-size: large;
  color: antiquewhite;
}

main {
  display: flex;
  flex-direction: column;
  justify-items: center;
  align-items: center;
}

button {
  margin: 1rem;
  font-size: xx-large;
  border: rgb(0, 0, 0, 0) 3px solid;
}

button:hover {
  border: rgb(0, 0, 0) 3px solid;
  background-color: aquamarine;
}

table {
  background-color: white;
  margin-top: 2rem;
  margin-left: auto;
  margin-right: auto;
  border: solid black 5px;
}
td {
  background-color: #dfe0e4;
  border: 1px solid rgb(0, 0, 0);
  width: 10px;
  height: 10px;
}

li {
  padding: 0.2rem;
}

.alive {
  background-color: #1f7035;
  animation: random 4s infinite;
}

.hidden {
  display: none;
}

.pulse {
  animation: pulse 2s infinite;
}

@keyframes pulse {
  0% {
    transform: scale(0.9);
  }

  70% {
    transform: scale(1);
  }

  100% {
    transform: scale(0.9);
  }
}

@keyframes random {
  15% {
    background-color: #144621;
  }
  30% {
    background-color: #1a5e2c;
  }
  45% {
    background-color: #289144;
  }
  60% {
    background-color: #2eaa4f;
  }
  75% {
    background-color: #36c75d;
  }
}