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

body{
  background-color: rgb(0, 4, 85);
}

.app{
  background: white;
  width: 90%;
  max-width: 600px;
  margin: 100px auto 0;
  border-radius: 10px;
  padding: 30px;
}

.app h1{
  font-size: 25px;
  color: #001e4d;
  font-weight: 600;
  border-bottom: 1px solid #333;
  padding-bottom: 30px;
}
.quiz{
padding: 20px 0;
}

.quiz h2{
  font-size: 18px;
  color: #001e4d;
  font-weight: 600;

}
.btn{
  background: white;
  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: white;

}

.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: none;

}
.correct{
  background-color: green;
}

.incorrect{
  background-color: rgb(243, 24, 24);
}