.lesson-nav {
    margin-top: 40px;
    margin-bottom: 20px;
    display: flex;
    justify-content: space-between;
}

.lesson-nav-button {
    padding: 12px 18px;
    border-radius: 6px;
    text-decoration: none !important;
    font-size: 0.9em;
    font-weight: 600;
    color: white !important;
    background: #0057ff;
    transition: background 0.2s ease;
}

.lesson-nav-button:hover {
    background: #0039c9;
}

.lesson-nav-button.left {
    margin-right: auto;
}

.lesson-nav-button.right {
    margin-left: auto;
}