@import url('https://fonts.googleapis.com/css2?family=Poppins:wght@400;500;700&display=swap');

body {
  font-family: 'Poppins', sans-serif;
  background: #b9b3a9;
  display: flex;
  justify-content: center;
}

.container {
  width: 450px;
  padding: 20px;
  margin-top: 80px;
  background-color: #fff;
  box-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
  border-radius: 20px;
}

flip-card {
  background-color: transparent;
  width: 300px;
  height: 300px;
  perspective: 1000px;
  padding: 5px, 5px, 5px, 5px;
  border-radius: 20px;
}

.flip-card-inner {
  position: relative;
  width: 450px;
  height: 450px;
  text-align: center;
  transition: transform 0.6s;
  transform-style: preserve-3d;
  box-shadow: 4px 4px 8px 4px rgba(0,0,0,0.2);
  border-radius: 20px;
}

.flip-card:hover .flip-card-inner {
  transform: rotateY(180deg);
  padding: 5px, 5px, 5px, 5px;
  border-radius: 20px;
}

.flip-card-front, .flip-card-back {
  color: #fff;
  position: fixed;
  width: 100%;
  height: 100%;
  border-radius: 20px;
  -webkit-backface-visibility: hidden;
  backface-visibility: hidden;
}

.flip-card-front {
  background-color: #bbb;
}

.front-img {
  width:450px;
  height:450px; 
  border-radius: 20px;
}

.flip-card-back {
  width: 100%;
  background-color: #2a74a5;
  padding: 15px, 15px;
  transform: rotateY(180deg);
}

h1, h3 {
  text-align: center;
}

.question {
  font-weight: bold;
  margin-bottom: 10px;
}

.quiz {
  width: 80%;
  display: block;
  padding-left: 10px;
  padding-right: 10px;  
}

.options {
  margin-bottom: 20px;
}

.option {
  display: block;
  margin-bottom: 10px;
}

.button {
  display: inline-block;
  padding: 10px, 20px;
  background-color: #428bca;
  color: #fff;
  border: none;
  cursor: pointer;
  font-size: 16px;
  border-radius: 4px;
  transition: background-color 0.3s;
  margin-right: 10px;
}

.button:hover {
  background-color: #3071a9;
}

.result {
  text-align: center;
  margin-top: 20px;
  font-weight: bold;
}

.hide{
  display: none;
}

#progress-bar-container {
  width: 100%;
  height: 20px;
  background: #f3f3f3;
  margin-bottom: 20px;
}

#progress-bar {
  height: 100%;
  width: 0;
  background: #4caf50;
}