* {
  padding: 0;
  margin: 0;
  box-sizing: border-box;
}

body {
  display: flex;
  flex-direction: column;
  row-gap: 50px;
  justify-content: center;
  align-items: center;
  height: 100vh;
}

button {
  border: none;
  outline: none;
  background-color: #fff;
}

#game {
  width: 350px;
  aspect-ratio: 1/2;
  background-color: #000;
  display: flex;
  flex-wrap: wrap;
  position: relative;
}

.grid-item {
  outline: 2px solid #000000;
  background: #000000;
}

#start {
  padding: 10px 20px;
  border-radius: 8px;
  background-color: #00ff6a;
  cursor: pointer;
  margin: 10px;
}

#message {
  color: #fff;
  font-size: large;
  font-weight: 600;
  position: absolute;
  z-index: 999;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  text-align: center;
}

.hide {
  display: none;
}

.red {
  background-color: #ff0000;
}

#time {
  margin-top: -100px;
  font-size: 1.25em;
}

#score {
  font-size: 1.25em;
}