body{
  background-color: #263238;
  color: #ddd;
  font-family: courier;
  display: grid;
  align-content: center;
  justify-content: center;
  height: 100vh;
  overflow: hidden;
}

h1{
  font-size: 14pt;
  font-weight: normal;
}

#grid{
  margin-left: auto;
  margin-right: auto;
}

#grid tr td{
  border: 1px solid #fff;
  background-color: #999;
  width: 20px;
  height: 20px;
  text-align: center;
}

#grid tr td.active{
  background-color: #333;
}

#grid tr td.mine{
  background-color: #d84315;
}

button{
  margin: 12px 0;
  padding: 4px 0;
  border: none;
  outline: none;
  cursor: pointer;
}