* {
    margin: 0;
    padding: 0;
    outline: 0;
    border: 0;
    appearance: 0;
    list-style: none;
    text-decoration: none;
  }
  body {
    font-family: Arial, Helvetica, sans-serif;
    font-weight: bold;
    text-align: center;
    height: 100vh;
    background-color: #111;
    color: #fff;
  }
  h1 {
    margin:6rem 0 0 0;
    color: rgb(48, 48, 197);
  }


  #board {
    width: 350px;
    height: 350px;
    border: 5px solid darkgray;
    background-color: lightgray;
    margin: auto;
    margin-top: 5rem;
    display: flex;
    flex-wrap: wrap;
  }
  #board div {
    width: 42px;
    height: 42px;
    border: 1px solid whitesmoke;
    font-size: 30px;
    display: flex;
    justify-content: center;
    align-items: center;
  }
  .tile-clicked {
    background-color: darkgrey;
  }
  .x1 {
    color: blue;
  }
  .x2 {
    color: green;
  }
  .x3 {
    color: red;
  }
  .x4 {
    color: navy;
  }
  .x5 {
    color: brown;
  }
  .x6 {
    color: teal;
  }
  .x7 {
    color: black;
  }
  .x8 {
    color: gray;
  }
  #flag-button {
    width: 100px;
    height: 50px;
    font-size: 30px;
    background-color: lightgray;
    border: none;
    margin-top: 2rem;
  }