* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}
html,
body {
  height: 100%;
}
body {
  display: flex;
  justify-content: center;
  align-items: center;
  flex-direction: column;
  user-select: none;
  font-family: Verdana, Geneva, Tahoma, sans-serif;
  background-color: #024059;
  color: white;
  text-align: center;
}
button {
  padding: 1rem;
  border: none;
  cursor: pointer;
  border: solid white 1px;
  background-color: transparent;
  color: white;
  border-radius: 5%;
}
h1,
h2 {
  margin: 1rem;
  text-align: center;
  font-family: "Gill Sans", "Gill Sans MT", Calibri, "Trebuchet MS", sans-serif;
  font-size: 2rem;
  text-transform: uppercase;
}
.color-select,
.mode-select {
  display: flex;
  justify-content: center;
  align-items: center;
  gap: 1rem;
}
.open-instructions {
  position: absolute;
  top: 5rem;
  right: 5rem;
}
.instructions {
  height: 25rem;
  width: 15rem;
  position: absolute;
  top: 10rem;
  right: 5rem;
  border: solid 1px white;
  padding: 1rem;
  text-align: center;
}
.instructions h2 {
  text-transform: none;
}
.splash-screen,
.game-over-screen {
  text-align: center;
  display: flex;
  justify-content: center;
  align-items: center;
  flex-direction: column;
  gap: 2rem;
}
.captured-pieces {
  background-color: transparent;
  border: solid 1px white;
  position: absolute;
  left: 5rem;
  top: 5rem;
  height: 35rem;
  width: 15rem;
  text-align: center;
}
.captured-pieces img {
  width: 15%;
}
.captured-pieces div {
  height: 50%;
}
.captured-pieces h3 {
  margin: 1rem;
}
.turn-display {
  margin: 1rem;
  text-align: center;
}
.messages {
  position: absolute;
  height: 100%;
  width: 100%;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background-color: red;
  opacity: 0.5;
  z-index: -999;
}
.timer {
  margin: 0.5rem;
}
.board {
  display: grid;
  grid-template-columns: repeat(8, 4rem);
  grid-template-rows: repeat(8, 4rem);
  justify-content: center;
  border: solid white 1px;
}
.tile {
  display: flex;
  justify-content: center;
  align-items: center;
  background-color: white;
}
.tile img {
  width: 100%;
  height: 100%;
  cursor: pointer;
}
.tile:nth-child(even):not(.different) {
  background-color: #04bf8a;
  color: white;
}
.different:nth-child(odd) {
  background-color: #04bf8a;
  color: white;
}
.hidden {
  display: none;
}