minesweeper.css

html, body {
  height: 100%;
  font-family: 'Montserrat', sans-serif, Arial;
}

body {
  display: flex;
  align-items: center;
  justify-content: flex-center;
  flex-direction: column;
}

#message, #notes {
  display: flex;
  flex-direction: column;
  align-items: center;
}

#message {
  font-size: 1.5rem;
}

.board {
  display: flex;
  flex-wrap: wrap;
}

.board div {
  color: green;
  font-size: 2rem;
  width: 75px;
  height: 75px;
  border: 1px #ccc dotted;
  border-radius: 10%;
  background-color: white;
  margin: 3px;
  display: flex;
  align-items: center;
  justify-content: center;
}

.board div:hover {
  background-color: white;
}

div.mine, div.mine:hover {
  background: no-repeat center/60% url("images/bomb.svg") crimson;
}

div.hidden {
  background: #eee;
}

div.hidden:hover {
  background: #ccc;
}

div.marked, div.marked:hover {
  background: no-repeat center/60% url("images/mark.svg") deepskyblue;
}

.button {
  display: inline-block;
  padding: 0 15px 0 15px;
}

.buttons {
  position: relative;
  text-align: center;
  padding-right: 10px;
}

#reset {
  background-color: transparent;
  font-family: 'Montserrat', sans-serif, Arial;
}

#smaller {
  background-color: transparent;
  font-family: 'Montserrat', sans-serif, Arial;
}

#bigger {
  background-color: transparent;
  font-family: 'Montserrat', sans-serif, Arial;
}