style.css

@import url("https://fonts.googleapis.com/css?family=Montserrat:400,800");
@import url('https://fonts.googleapis.com/css2?family=Permanent+Marker&display=swap');
.container {
    width: 500px;
    align-content: center;
    font-family: 'Permanent Marker', cursive;
  }
  
  .grid {
    height: 400px;
    width: 400px;
    display: flex;
    flex-wrap: wrap;
    background-color: #dcd6bc;
    margin-left: 50px;
    margin-top: 20px;
    border: 10px solid #dcd6bc;
    margin-bottom: 10px;
  }
  
  div {
    font-size: 25px;
    text-align: center;
    font-family: 'Roboto Mono', monospace;
  
  }
  .valid {
    height: 40px;
    width: 40px;
    border: 5px solid;
    border-color: #f5f3eb #bab7a9 #bab7a9 #fff9db;
    box-sizing: border-box;
  }
  
  .checked {
    height: 40px;
    width: 40px;
    border: 2px solid;
    background-color: #cecab7;
    border-color: #9c998d;
    box-sizing: border-box;
  }
  
  .bomb {
    height: 40px;
    width: 40px;
    border: 5px solid;
    border-color: #f5f3eb #bab7a9 #bab7a9 #fff9db;
    box-sizing: border-box;
  }
  
  .one {
    color: #e76346;
  }
  
  .two {
    color: #4199d3;
  }
  
  .three {
    color: #57da59;
  }
  
  .four{
    color: #bb41d3;
  }
  
  #result {
    margin-top: 5px;
    color: #e76346;
  }
  footer {
    background-color: #222;
    color: #fff;
    font-size: 14px;
    bottom: 0;
    position: fixed;
    left: 0;
    right: 0;
    text-align: center;
    z-index: 999;
}

footer p {
    margin: 10px 0;
}

footer i {
    color: red;
}

footer a {
    color: #3c97bf;
    text-decoration: none;
}