html {
  background: repeating-radial-gradient(circle, #1c1c1c, transparent 20%);
  background-size: 2em 2em;
  background-color: #000000;
  opacity: 1;
}

* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
  font-family: "Poppins", sans-serif;
}

body {
  height: 100vh;
  display: flex;
  justify-content: center;
  align-items: center;
  color: #e4e4e4;
}

.quiz-container {
  background: rgba(20, 20, 20, 0.85);
  border: 2px solid rgba(100, 255, 218, 0.3);
  box-shadow: 0 0 20px rgba(100, 255, 218, 0.2),
              inset 0 0 10px rgba(100, 255, 218, 0.1);
  border-radius: 16px;
  width: 450px;
  max-width: 90%;
  padding: 35px 40px;
  backdrop-filter: blur(10px);
  text-align: center;
}

.quiz-container h2 {
  font-size: 1.2rem;
  color: #ffffff;
  margin-bottom: 25px;
  font-weight: 300;
}

.answer-btn {
  display: block;
  width: 100%;
  background: rgba(255, 255, 255, 0.05);
  color: #e4e4e4;
  border: 1px solid rgba(100, 255, 218, 0.2);
  border-radius: 10px;
  padding: 12px 15px;
  margin: 10px 0;
  font-size: 1rem;
  cursor: pointer;
  transition: all 0.3s;
}

.answer-btn:hover {
  background: rgba(100, 255, 218, 0.15);
  box-shadow: 0 0 8px rgba(100, 255, 218, 0.3);
}

.answer-btn.correct {
  background: rgba(100, 255, 218, 0.3);
  border-color: rgba(100, 255, 218, 0.8);
  box-shadow: 0 0 15px rgba(100, 255, 218, 0.6);
}

.answer-btn.wrong {
  background: rgba(255, 99, 99, 0.3);
  border-color: rgba(255, 99, 99, 0.7);
  box-shadow: 0 0 10px rgba(255, 99, 99, 0.5);
}

.next-btn {
  margin-top: 25px;
  background: linear-gradient(135deg, #64ffda, #00bcd4);
  color: #000;
  border: none;
  padding: 12px 15px;
  border-radius: 10px;
  cursor: pointer;
  font-size: 1rem;
  font-weight: 600;
  width: 100%;
  transition: all 0.3s ease;
  display: none;
}

.next-btn:hover {
  background: linear-gradient(135deg, #00e5ff, #64ffda);
  transform: translateY(-2px);
}