* {
  margin: 0;
  padding: 0;
  font-family: "poppins", sans-serif;
  box-sizing: border-box;
}
body {
  background-color: #0f1e2b;
}
.app {
  background-color: white;
  width: 90%;
  max-width: 600px;
  margin: 100px auto 0;
  border-radius: 10px;
  padding: 30px;
}
.app h1 {
  font-weight: bold;
  font-size: 25px;
  color: darkgray;
  border-bottom: 1px solid darkgray;
  padding-bottom: 30px;
}
.quiz {
  padding: 20px 0;
}
.quiz h2 {
  font-size: 18px;
  color: #232323;
}

.quiz .btn {
  background-color: #fff;
  color: black;
  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;
  user-select: none;
}
.quiz .btn:hover:not([disabled]) {
  background-color: #222;
  color: #fff;
}
.btn:disabled {
  cursor: no-drop;
}
#next-btn {
  background-color: #0f1e2b;
  color: white;
  padding: 10px;
  font-weight: 900;
  width: 150px;
  margin: 20px auto 0;
  border-radius: 5px;
  border: 1px solid gray;
  cursor: pointer;
  display: none;
}

.app .correct {
  background-color: green;
  color: white;
}
.app .incorrect {
  background-color: red;
  color: white;
}
article {
  background-color: white;
  min-height: 100px;
  max-width: 600px;
  width: 90%;
  margin: 10px auto;
  border-radius: 10px;
  display: flex;
  align-items: center;
  justify-content: center;
}
.random-btn {
  background-color: #0089ff;
  border: 1px solid gray;
  padding: 10px;
  display: block;
  margin: 15px auto;
  cursor: pointer;
  color: white;
  border-radius: 10px;
}
.hide {
  display: none;
}
p {
  font-size: 15px;
  text-shadow: 2px 7px 5px rgba(0, 0, 0, 0.3),
    0px -4px 10px rgba(255, 255, 255, 0.3);
  max-width: 300px;
  margin: auto;
  text-align: center;
}
h1 {
  color: green;
}