body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
    margin: 0;
    padding: 0;
    line-height: 1.6;
}
.page-wrapper {
    display: flex;
    flex-direction: row;
    min-height: 100vh;
}
.sidebar {
    width: 250px;
    background: #f7f7f7;
    padding: 20px;
    box-sizing: border-box;
    border-right: 1px solid #ddd;
    position: sticky;
    top: 0;
    height: 100vh;
    overflow-y: auto;
}
.sidebar h1 {
    font-size: 1.5em;
    margin-top: 0;
}
.sidebar nav ul {
    list-style: none;
    padding-left: 0;
}
.sidebar nav ul li {
    margin-bottom: 10px;
}
.sidebar nav ul li a {
    text-decoration: none;
    color: #3498db;
    font-weight: bold;
}
.content {
    flex-grow: 1;
    padding: 30px;
    box-sizing: border-box;
    max-width: 960px;
    margin: auto;
}
h1, h2, h3 {
    border-bottom: 1px solid #eaecef;
    padding-bottom: 0.3em;
}
a {
    color: #3498db;
}

mark {
  background-color: #f7f7f7; /* Replace #ff0000 with your desired color code or name */
  color: #3498db; /* Optional: Change text color for better contrast */
}

/* Responsive layout */
@media (max-width: 768px) {
    .page-wrapper {
        flex-direction: column;
    }
    .sidebar {
        width: 100%;
        height: auto;
        position: relative;
        border-right: none;
        border-bottom: 1px solid #ddd;
    }
}