body {
  font-family: Arial, sans-serif;
  background-color: white;
  margin: 0;
}

header {
  background-color: white;
  padding: 20px;
  text-align: center;
}

nav {
  background-color: #333;
  padding: 10px;
  text-align: center;
}

nav a {
  color: white;
  text-decoration: none;
  margin: 0 10px;
}

nav a:hover {
  text-decoration: underline;
}

nav2 {
  background-color: #d0deef;
  padding: 10px;
  text-align: center;
}

nav2 a {
  color: white;
  text-decoration: none;
  margin: 0 10px;
}

nav2 a:hover {
  text-decoration: underline;
}

main {
  padding: 15px;
}

.card {
  background-color: #dfecf0;
  border: 1px solid #ccc;
  border-radius: 12px;
  padding: 15px;
  margin: 15px 0;
}

button {
  padding: 10px 14px;
  border: none;
  border-radius: 10px;
  cursor: pointer;
}

button:hover {
  background-color: #ddd;
}

img {
  max-width: 100%;
  border-radius: 12px;
}


.dropbtn {
  background-color: #04AA6D;
  color: white;
  padding: 16px;
  font-size: 16px;
  border: none;
}

.dropdown {
  position: relative;
  display: inline-block;
}

.dropdown-content {
  display: none;
  position: absolute;
  background-color: #333;
  min-width: 160px;
  box-shadow: 0px 8px 16px 0px rgba(0,0,0,0.2);
  z-index: 1;
}

.dropdown-content a {
  color: white;
  padding: 15px;
  text-decoration: none;
  display: block;
}

.dropdown-content a:hover {background-color: #200;}

.dropdown:hover .dropdown-content {display: block;}

.dropdown:hover .dropbtn {background-color: #3e8e41;}


.flashcard {
    	width: 400px;
	height: 200px;
	cursor: pointer;
    	border: 1px solid #f1f1f1
	perspective: 1000px;
    
}

.card-inner {
	position: relative;
	width: 100%;
	height: 100%;
	text-align: center;
	transition: transform 0.8s;
	transform-style: preserve-3d; 
}

.flashcard.flipped .card-inner {
    transform: rotateY(180deg);
}

.card-front, .card-back {
    position: absolute;
    width: 100%;
    height: 100%;
    backface-visibility: hidden;

    display: flex;
    align-items: center;
    justify-content: center;

    border-radius: 10px;
    font-family: Arial;
    font-size: 18px;
}

.card-front {
    background-color: #008080;
    color: white;
}

.card-back {
    background-color: #7851a9;
    color: white;
    transform: rotateY(180deg);
}