body {
  font-family: "Century Gothic", Futura, sans-serif;
  display: flex;
  justify-content: center;
  align-items: center;
  height: 100vh;
  margin: 0;
  background-image: linear-gradient(to right,
      hsl(211, 100%, 50%),
      hsl(179, 100%, 30%));
  color: white;
  position: relative;
  transition: background 0.5s linear;
  -webkit-touch-callout: none;
  -webkit-user-select: none;
  -khtml-user-select: none;
  -moz-user-select: none;
  -ms-user-select: none;
  user-select: none;
}

body::before {
  content: "";
  position: fixed;
  top: 0;
  right: 0;
  bottom: 0;
  left: 0;
  background-image: linear-gradient(to bottom,
      hsl(195, 100%, 50%),
      hsl(195, 39%, 59%));
  z-index: -1;
  transition: opacity 0.5s linear;
  opacity: 0;
}

.fade-in::before {
  opacity: 1;
}

.container {
  text-align: center;
}

.container #stateTurn {
  font-size: 1.2rem;
  font-weight: bold;
  padding: 10px;
}

.board {
  display: grid;
  grid-template-columns: repeat(3, 100px);
  grid-gap: 10px;
  position: relative;
  /* Set game board to relative position */
}

.cell {
  width: 100px;
  height: 100px;
  border: 2.5px solid #fff;
  border-radius: 5px;
  font-size: 2em;
  display: flex;
  justify-content: center;
  align-items: center;
  cursor: pointer;
}

#instruction {
  font-size: 1.2em;
}

h1 {
  font-family: Arial, Helvetica, sans-serif;
  font-size: 48px;
  font-weight: lighter;
}

a,
body {
  color: #fff;
}

.settings-container {
  display: flex;
  flex-direction: column;
  position: absolute;
  top: 0;
  right: 20px;
  border: #fff 2.5px solid;
  border-radius: 5px;
  padding: 20px;
  margin-top: 5px;
}

.settings-container button,
select {
  background-color: #fff;
  color: #000;
  font-weight: bold;
  border: none;
  border-radius: 5px;
  padding: 10px 15px;
  margin-bottom: 5px;
  cursor: pointer;
}

.settings-container button:hover,
select:hover {
  background-color: #e6e6e6;
  color: #000;
  font-weight: bold;
  border: none;
  border-radius: 5px;
  padding: 10px 15px;
  margin-bottom: 5px;
  cursor: pointer;
}

/* Settings-container mobile compatible */
@media (max-width: 768px) {
  .settings-container {
    position: static;
    margin-top: 10px;
  }
}

.menu-btn-container {
  position: absolute;
  top: 0;
  left: 0;
  padding: 5.5px;
}

.menu-btn-container button {
  background-color: transparent;
  border: transparent;
  transition: 0.7s;
}

.menu-btn-container button:hover {
  transform: scale(1.2);
  cursor: pointer;
}

.menu-btn-container {
  position: fixed;
  top: 20px;
  left: 20px;
  z-index: 1000;
}

#menu {
  background: none;
  border: none;
  cursor: pointer;
  outline: none;
}

#menu img {
  transition: transform 0.3s;
}

#overlay {
  position: fixed;
  top: 0;
  left: 0;
  width: 0;
  height: 100%;
  background-color: rgba(0, 0, 0, 0.8);
  overflow-x: hidden;
  transition: 0.5s;
  z-index: 999;
}

#menu-links {
  position: absolute;
  top: 50%;
  transform: translateY(-50%);
  width: 100%;
  text-align: center;
  color: #fff;
}

#menu-links a {
  display: block;
  padding: 20px;
  font-size: 20px;
  text-decoration: none;
  color: #fff;
  transition: 0.7s;
}

#menu-links a:hover {
  transform: scale(1.2);
  cursor: pointer;
}

.cell {
  font-weight: bold;
  font-size: 2em;
}

.cell:hover {
  background-color: rgba(255, 255, 255, 0.1);
}

#stateResult {
  font-weight: bold;
  font-size: 32px;
  color: red;
}