body {
  font-family: Arial, Helvetica, sans-serif;
  --submit-btn-background: #5f7cda;
  --submit-btn-foreground: #fff;
  --submit-btn-border: #a3a3a3;
  --quiz-container-background: #fff;
  --quiz-container-border: #ccc;
}

.quiz-container {
  max-width: 600px;
  margin: 0 auto;
  padding: 20px;
  border: 1px solid var(--quiz-container-border);
  background-color: var(--quiz-container-background);
  border-radius: 5px;
  display: flex;
  justify-content: center;
  flex-direction: column;
  align-items: center;
}

button {
  width: 100px;
  height: 40px;
  font-size: 15px;
  font-weight: bold;
  margin-top: 10px;
  background-color: var(--submit-btn-background);
  color: var(--submit-btn-foreground);
  border: 2px solid var(--submit-btn-border);
  box-shadow: 2px 2px 2px 0 rgba(0, 0, 0, 0.6);
  border-radius: 2px;
  cursor: pointer;
  -webkit-border-radius: 2px;
  -moz-border-radius: 2px;
  -ms-border-radius: 2px;
  -o-border-radius: 2px;
}

input {
  width: 100%;
  padding: 8px;
  margin-top: 10px;
  border: 1px solid #ccc;
  border-radius: 5px;
}
input:disabled {
  cursor: not-allowed;
  background-color: #e9e9e9;
}

#feedback {
  margin-top: 10px;
}

#next-button {
  margin-top: 10px;
}