body {
    font-family: Arial, sans-serif;
    margin: 0;
    background: #f5f5f5;
    color: #222;
}

header {
    background: #111;
    color: white;
    padding: 20px;
}

nav a {
    color: white;
    margin-right: 15px;
    text-decoration: none;
}

main {
    padding: 20px;
}

.post {
    background: white;
    padding: 15px;
    margin-bottom: 20px;
    border-radius: 8px;
}

textarea {
    width: 100%;
    height: 120px;
    margin-bottom: 10px;
}

button {
    padding: 10px 20px;
}