* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

body {
  margin: 0;
  padding: 0;
  background-size: cover;
}

.one {
  min-height: 100vh;
  display: flex;
  /* background-color: #FDE68A; */
  /* background-color: #D1D5DB; */
  background-color: #f3f4f6;
}

header {
  background-color: #fcd34d;
  width: 100%;
  padding: 1rem;
  border-bottom-left-radius: 1.4rem;
}

.header h1 {
  color: black;
  font-size: 2rem;
}

.one {
  padding: 2rem;
}

.one .image {
  max-width: 400px;
  display: block;
  margin: auto;
  border-radius: 10%;
  padding: 2rem;
}

.one h2,
.one h4 {
  text-align: center;
  font-size: 2rem;
  color: black;
}

.gameContainer {
  width: 600px;
  height: 600px;
  margin: auto;
  display: flex;
  flex-wrap: wrap;
  perspective: 1000px;
}

.card {
  width: 23%;
  height: 23%;
  margin: 5px;
  position: relative;
  transform-style: preserve-3d;
  transition: transform 0.3s;
  cursor: pointer;
  background-color: transparent;
}

.card:active {
  transform: scale(0.95);
  transition: transform 0.2s ease-in-out;
}

.card.flip {
  transform: rotateY(180deg);
  cursor: pointer;
}

.front,
.back {
  background-color: black;
  width: 100%;
  height: 100%;
  padding: 10px;
  border-radius: 4px;
  position: absolute;
  backface-visibility: hidden;
}

.front {
  transform: rotateY(180deg);
}

.two {
  background-color: #fcd34d;
  text-align: center;
}

footer {
  padding-top: 1rem;
  background-color: black;
  text-align: center;
  padding-bottom: 0.5rem;
}

footer ul {
  list-style: none;
}
footer ul li {
  display: inline;

  padding-right: 0.5rem;
}

footer ul li a {
  text-decoration: none;
  color: black;
  font-weight: bold;
}

.info h1 {
  font-size: 1rem;
}

.two {
  padding: 1rem;
}

#demo {
  font-size: 1.4rem;
}

#btn2 , #btn3{
  background-color: black;
  padding: 1rem;
  color: yellow;
  border-radius: 10px;
}