caa-game/css/index.css

html, body {
  margin: 0;
  height: 100vh;
  width: 100vw;
  background: lightskyblue;
  font-family: sans-serif;
}

h1 {
  text-align: center;
}

ul {
  list-style-type: none;
  text-align: center;
  padding: 0;
  display: grid;
}

li {
  width: 25vw;
  padding: 10px 20px;
  margin: 0 auto;
  margin-top: 20px;
  background: #9ea399;
  border-radius: 5px;
  border: 2px solid #1c1914;
  cursor: pointer;
}

li:hover {
  box-shadow: 2px 2px #1c1914;
}