body {
    font-family: Arial, sans-serif;
    background-color: #edf7ed;
    color: #2c3e50;
    margin: 0;
    display: flex;
    flex-direction: column;
    min-height: 100vh;
}

main {
    flex: 1;
    max-width: 1100px;
    min-width: 720px;
    margin: 20px auto;
    border-radius: 10px;
    overflow: hidden;
    padding-bottom: 20px;
}

header {
    background-color: #154300;
    padding: 10px;
    color: #ffffff;
}

footer {
    background-color: #154300;
    color: #ffffff;
    text-align: center;
    padding: 10px 0px 0px 0px;
}

footer a {
    color: #ffffff;
    text-decoration: underline;
}

footer a:hover {
    text-decoration: none;
}

a {
    color: #154300;
    font-weight: bold;
}

.announcement {
    background-color: #fff3cd;
    border-left: 6px solid #ffcc00;
    border-radius: 8px;
    padding: 15px;
    margin-bottom: 20px;
    font-size: 16px;
    color: #856404;
    text-align: center;
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
}