```css
/* Custom styles for Learning App */
body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
}

/* Custom button styles */
.btn {
    transition: all 0.3s ease;
}

.btn:hover {
    transform: translateY(-2px);
}

/* Course card hover effect */
.course-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 10px 20px rgba(0, 0, 0, 0.1);
    transition: all 0.3s ease;
}

/* Quiz option hover effect */
.quiz-option:hover {
    background-color: #f0f0f0;
}

/* Progress bar animation */
.progress-bar {
    transition: width 0.6s ease;
}
```