body {
    font-family: 'Arial', sans-serif;
    background: #f9f9f9;
    color: #333;
    margin: 0;
    padding: 0;
}

header {
    background: #27496d;
    color: #fff;
    padding: 1rem;
    text-align: center;
}

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

header nav ul li {
    display: inline;
    margin-right: 20px;
}

header nav ul li a {
    color: #fff;
    text-decoration: none;
}

header nav ul li a.active,
header nav ul li a:hover {
    color: #ffdd57;
}

main {
    padding: 20px;
    text-align: center;
}

#simulation-container button {
    background-color: #4CAF50;
    color: white;
    border: none;
    padding: 15px 32px;
    text-align: center;
    text-decoration: none;
    display: inline-block;
    font-size: 16px;
    margin: 4px 2px;
    cursor: pointer;
}

footer {
    background: #27496d;
    color: white;
    text-align: center;
    padding: 1rem;
    position: fixed;
    bottom: 0;
    width: 100%;
}