body {
    font-family: 'Arial', sans-serif;
    margin: 0;
    padding: 0;
    background-color: #f4f4f4;
    display: flex;
    flex-direction: column;
    height: 100vh;
}

header {
    background-color: #4CAF50;
    color: white;
    text-align: center;
    padding: 1em;
    box-shadow: 0 4px 8px rgba(0, 0, 0, 0.1);
}

.logo {
    display: block;
    margin: 0 auto;
    max-width: 150px;
}

nav {
    background-color: #333;
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
}

nav ul {
    list-style-type: none;
    margin: 0;
    padding: 0;
    overflow: hidden;
    display: flex;
    justify-content: center;
}

nav ul li {
    margin: 0 10px;
}

nav ul li a {
    display: block;
    color: white;
    text-align: center;
    padding: 14px 16px;
    text-decoration: none;
    font-weight: bold;
    text-shadow: 1px 1px 2px rgba(0, 0, 0, 0.2);
}

nav ul li a:hover {
    background-color: #111;
    box-shadow: inset 0 0 5px rgba(0, 0, 0, 0.5);
}

main {
    flex: 1;
    display: flex;
    flex-direction: column;
    padding: 1em;
}

.content-window {
    flex: 1;
    overflow: hidden;
    box-shadow: 0 4px 8px rgba(0, 0, 0, 0.1);
}

.markdown-content {
    width: 100%;
    height: 100%;
    overflow-y: auto;
    padding: 20px;
    background-color: white;
}

footer {
    text-align: center;
    padding: 1em;
    background-color: #f1f1f1;
    box-shadow: 0 -2px 4px rgba(0, 0, 0, 0.1);
}

footer button {
    margin: 5px;
    padding: 10px 20px;
    background-color: #4CAF50;
    color: white;
    border: none;
    cursor: pointer;
    font-weight: bold;
    text-shadow: 1px 1px 2px rgba(0, 0, 0, 0.2);
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
}

footer button:hover {
    background-color: #45a049;
    box-shadow: 0 4px 8px rgba(0, 0, 0, 0.2);
}