body {
    margin: 0;
    padding: 0;
    font-family: Arial, sans-serif;
}

#header {
    background-color: #666;
    color: white;
    padding: 20px;
    text-align: center;
    width: 100%;
    position: fixed;
    top: 0;
}

#leftMenu {
    background-color: #f1f1f1;
    width: 180px;
    position: fixed;
    height: 100%;
    overflow: auto;
    top: 130px;
    left: 0;
}

#content {
    margin-left: 200px;
    margin-right: 10px;
    margin-top: 150px;
}

.menu-category {
    padding: 10px;
    background-color: #ddd;
    cursor: pointer;
}

.submenu {
    display: none;
    padding-left: 20px;
}

.submenu a {
    display: block;
    color: black;
    padding: 8px;
    text-decoration: none;
}

.submenu a:hover {
    background-color: #ccc;
}

.active {
    display: block;
}

.menu-category {
    font-weight: bold;
    cursor: pointer;
    margin: 10px 0;
    background-color: #f0f0f0;
    padding: 10px;
    border-radius: 5px;
}

.menu-category:hover {
    background-color: #d9d9d9;
}

.submenu {
    margin-left: 20px;
    margin-top: 5px;
}

.submenu a {
    display: block;
    text-decoration: none;
    color: #007BFF;
    margin-bottom: 5px;
}

.submenu a:hover {
    color: #0056b3;
    text-decoration: underline;
}