body {
    font-family: Arial, sans-serif;
    margin: 0;
    padding: 0;
    background-color: #f0f0f0;
}

.container {
    display: flex;
}

aside {
    width: 200px;
    background-color: #333;
    color: white;
    padding: 20px;
}

aside ul {
    list-style: none;
    padding: 0;
}

aside ul li {
    margin: 10px 0;
}

aside ul li a {
    color: white;
    text-decoration: none;
}

main {
    flex-grow: 1;
    padding: 20px;
    background-color: white;
}

h1 {
    font-size: 24px;
}

table {
    width: 100%;
    border-collapse: collapse;
}

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

th, td {
    padding: 8px;
    text-align: left;
}

th {
    background-color: #f2f2f2;
}

form {
    display: flex;
    flex-direction: column;
}

form label {
    margin-top: 10px;
}

form input, form textarea, form button {
    padding: 8px;
    margin-top: 5px;
}

.btn {
    display: inline-block;
    padding: 10px 20px;
    margin: 20px 0;
    background-color: #007BFF;
    color: white;
    text-decoration: none;
    border-radius: 5px;
}

#calendar {
    margin-top: 20px;
}