body {
    font-family: Arial, sans-serif;
    margin: 0;
    display: flex;
}

.sidebar {
    width: 250px;
    background: #f4f4f4;
    border-right: 1px solid #ccc;
    padding: 10px;
}

.main {
    flex-grow: 1;
    padding: 20px;
}

.tabs button {
    margin-right: 10px;
    padding: 8px 12px;
    cursor: pointer;
}

.tabs button.active {
    background: #007bff;
    color: white;
}

.tab-content {
    display: none;
}

.tab-content.active {
    display: block;
}

form {
    margin-bottom: 20px;
}

form input, form select, form button {
    margin-right: 10px;
    margin-bottom: 10px;
}

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

table th, table td {
    border: 1px solid #ddd;
    padding: 8px;
}

table th {
    background: #f2f2f2;
}

.sidebar .time-slot {
    height: 30px;
    border-bottom: 1px solid #eee;
}

.sidebar .lunch {
    background-color: purple;
}

.sidebar .free {
    background-color: lightgreen;
}

.sidebar .busy {
    background-color: red;
}