* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: Arial, Helvetica, sans-serif;
  }
  
.container {
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    background: #eee;
  }
  
h1 {
    font-size: 5rem;
    margin-bottom: 0.5em;
  }
  
h2 {
    margin-top: 1em;
    font-size: 2rem;
    margin-bottom: 0.5em;
  }
  
.play-area {
    display: grid;
    width: 300px;
    height: 300px;
    grid-template-columns: auto auto auto;
  }
  
.block {
    display: flex;
    width: 100px;
    height: 100px;
    align-items: center;
    justify-content: center;
    font-size: 3rem;
    font-weight: bold;
    border: 3px solid black;
    transition: background 0.2s ease-in-out;
  }
  
.block:hover {
    cursor: pointer;
    background: #0ff30f;
  }
  
.occupied:hover {
    background: #ff3a3a;
  }
  
.win {
    background: #0ff30f;
  }
  
.win:hover {
    background: #0ff30f;
  }
  
#block_0,
#block_1,
#block_2 {
    border-top: none;
  }
  
#block_0,
#block_3,
#block_6 {
    border-left: none;
  }
  
#block_6,
#block_7,
#block_8 {
    border-bottom: none;
  }
  
#block_2,
#block_5,
#block_8 {
    border-right: none;
  }
  
button {
    outline: none;
    border: 4px solid green;
    padding: 10px 20px;
    font-size: 1rem;
    font-weight: bold;
    background: none;
    transition: all 0.2s ease-in-out;
  }
  
button:hover {
    cursor: pointer;
    background: green;
    color: white;
  }
  
.playerWin {
    color: green;
  }
  
.computerWin {
    color: red;
  }
  
.draw {
    color: orangered;
  }
  
@media only screen and (max-width: 600px) {
  
    h1 {
      font-size: 3rem;
      margin-bottom: 0.5em;
    }
  
    h2 {
      margin-top: 1em;
      font-size: 1.3rem;
    }
  }