.w3s-wrapper {
    display: grid;
    grid-template-columns: 220px 1fr 260px;
    gap: 20px;
    max-width: 1200px;
    margin: 20px auto;
    padding: 0 15px;
    box-sizing: border-box;
    font-family: Arial, sans-serif;
}

.w3s-sidebar {
    background-color: #f1f1f1;
    padding: 15px;
    border: 1px solid #ddd;
}

.w3s-sidebar h3 {
    margin-top: 0;
    font-size: 18px;
}

.w3s-sidebar ul {
    list-style: none;
    padding-left: 0;
    margin: 0;
}

.w3s-sidebar li {
    margin-bottom: 8px;
}

.w3s-sidebar a {
    text-decoration: none;
    color: #000;
}

.w3s-sidebar a:hover {
    color: #04AA6D;
}

.w3s-main {
    background-color: #ffffff;
}

.w3s-title {
    font-size: 32px;
    border-bottom: 1px solid #ddd;
    padding-bottom: 10px;
    margin-bottom: 20px;
}

.w3s-content {
    line-height: 1.6;
}

.w3s-example-box {
    margin-top: 30px;
    border-left: 4px solid #04AA6D;
    background-color: #f9f9f9;
    padding: 15px;
}

.w3s-example-box h2 {
    margin-top: 0;
}

.w3s-example-inner {
    background-color: #fff;
    border: 1px solid #ddd;
    padding: 10px;
    overflow-x: auto;
}

.w3s-example-inner pre {
    margin: 0;
    font-family: Consolas, "Courier New", monospace;
    font-size: 14px;
}

.w3s-exercise-box {
    margin-top: 30px;
    background-color: #ffffcc;
    border: 1px solid #ffeb3b;
    padding: 15px;
}

.w3s-rightbox {
    background-color: #f1f1f1;
    padding: 15px;
    border: 1px solid #ddd;
    font-size: 14px;
}

/* Responsive */
@media (max-width: 900px) {
    .w3s-wrapper {
        grid-template-columns: 1fr;
    }

    .w3s-rightbox {
        order: 3;
    }

    .w3s-sidebar {
        order: 1;
    }

    .w3s-main {
        order: 2;
    }
}