* {
  margin: 0;
  padding: 0;
  font-family: sans-serif;
}

.banner {
  width: 100%;
  height: 100vh;
  background-image: linear-gradient(rgba(0, 0, 0, 0.75), rgba(0, 0, 0, 0.75)),
    url(beatles_liverpool_1962.jpg);
  background-size: cover;
  background-position: center;
}
.banner-text {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  color: #fff;
  font-size: 24px;
  font-family: sans-serif;
  text-transform: uppercase;
  text-align: center;
}
.banner-text {
  opacity: 0;
  animation: fadeInAnimation 1s ease-in forwards;
}
@keyframes fadeInAnimation {
  from {
    opacity: 0;
  }
  to {
    opacity: 1;
  }
}
.navbar {
  width: 80%;
  height: auto;
  padding: 35px 0;
  display: flex;
  align-items: center;
  justify-content: space-between;
  filter: drop-shadow(20px 20px 10px white);
  position: relative;
  z-index: 2;
}
.logo {
  width: 600px;
}
.navbar ul li {
  list-style: none;
  display: inline-block;
  margin: 0 20px;
  position: relative;
}
.navbar ul li a {
  text-decoration: none;
  color: #fff;
  text-transform: uppercase;
}
.navbar ul li ::after {
  content: "";
  height: 3px;
  width: 0;
  background: #fff;
  position: absolute;
  left: 0px;
  bottom: -10px;
  transition: 0.5s;
}
.navbar ul li a:hover::after {
  width: 100%;
}
body {
  background: #fff
}
.app {
  background: #fff;
  width: 90;
  max-width: 600px;
  margin: 100px auto 0;
  border-radius: 10px;
  padding: 30px;
  position: absolute; /* Position absolute */
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  z-index: 1; /* Set z-index higher than the background */
}
.app h1 {
  font-size: 25px;
  color: #001e4d;
  font-weight: 600;
  border-bottom: 1px solid #333;
  padding-bottom: 30px;
}
.quiz {
  padding: 20px 0;
  position: relative;
}
.quiz h2 {
  font-size: 18px;
  color: #001e4d;
  font-weight: 600;
}
.btn {
  background: #fff;
  color: #222;
  font-weight: 500;
  width: 100%;
  border: 1px solid #222;
  padding: 10px;
  margin: 10px 0;
  text-align: left;
  border-radius: 4px;
  cursor: pointer;
  transition: all 0.3s;
}
.btn:hover:not([disabled]) {
  background: #222;
  color: #fff;
}
.btn:disabled {
  cursor: no-drop;
}
#next-btn {
  background: #001e4d;
  color: #fff;
  font-weight: 500;
  width: 150px;
  border: 0;
  padding: 10px;
  margin: 20px auto 0;
  border-radius: 4px;
  cursor: pointer;
  display: block;
}
.correct {
  background: #9aeabc;
}
.incorrect {
  background: #ff9393;
}
.quizimagecredit p{
  width: 100%;
  padding: 10px 0;
  text-align: center;
  font-family: sans-serif;
  color: #000;
}