body {
    font-family: Arial, sans-serif;
    line-height: 1.6;
    margin: 0;
    padding: 0;
}

.container {
    display: flex;
    width: 100%;
}

.sidebar {
    background: #f4f4f4;
    padding: 20px;
    width: 250px;
    height: 100vh;
    box-shadow: 2px 0 5px rgba(0,0,0,0.1);
    position: fixed;
}

.sidebar h2 {
    text-align: center;
}

.sidebar nav ul {
    list-style: none;
    padding: 0;
}

.sidebar nav ul li {
    margin: 10px 0;
}

.sidebar nav ul li a {
    text-decoration: none;
    color: #333;
    font-weight: bold;
}

.sidebar nav ul li a:hover {
    text-decoration: underline;
}

.content {
    margin-left: 290px;
    padding: 10px;
    flex: 1;
}

header {
    margin-bottom: 20px;
}

header h1 {
    margin: 0;
}

section {
    margin-bottom: 20px;
}

section h2 {
    border-bottom: 2px solid #333;
    padding-bottom: 5px;
}

section h3 {
    margin: 10px 0 5px;
}

ul {
    list-style: disc;
    padding-left: 20px;
}

p, li {
    margin: 0 0 10px;
}

.counter-container {
    font-size: larger;
}

.counter {
    font-weight: bold;
    background-color: lightgreen;
}