body {
    font-family: Arial, sans-serif;
    margin: 0;
    padding: 0;
    background-color: #f4f4f4;
}

header {
    background-color: #333;
    color: #fff;
    padding: 1rem;
    text-align: center;
}

nav a {
    color: #fff;
    margin: 0 1rem;
    text-decoration: none;
}

main {
    padding: 2rem;
}

table {
    width: 100%;
    border-collapse: collapse;
    margin-top: 1rem;
}

table, th, td {
    border: 1px solid #ddd;
}

th, td {
    padding: 0.5rem;
    text-align: left;
}

th {
    background-color: #f4f4f4;
}

form {
    margin-top: 1rem;
}

label {
    display: block;
    margin-top: 0.5rem;
}

input, select, button {
    width: 100%;
    padding: 0.5rem;
    margin-top: 0.25rem;
}

button {
    background-color: #333;
    color: #fff;
    border: none;
    cursor: pointer;
}

button:hover {
    background-color: #555;
}

.announcements {
    margin-top: 1rem;
}

.announcement {
    background: #fff;
    padding: 1rem;
    margin-bottom: 1rem;
    border-radius: 5px;
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
}

.announcement h3 {
    margin-top: 0;
}

.announcement small {
    color: #666;
}