* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: Arial, sans-serif;
    background-color: #f5f5f5;
    padding: 20px;
}

.container {
    display: flex;
    flex-direction: row;
    max-width: 100%;
}

.sidebar {
    width: 20%;
    background-color: #e7e7e7;
    padding: 10px;
    height: fit-content;
}

.year-box {
    background-color: #fff;
    padding: 15px;
    margin-bottom: 10px;
    text-align: center;
    border: 1px solid #ddd;
    cursor: pointer;
    text-decoration: none;
    color: black;
}

.year-box:hover {
    background-color: #f0f0f0;
}

.content {
    width: 80%;
    padding: 0 20px;
}

h1 {
    text-align: center;
    margin-bottom: 20px;
}

.calendar {
    display: none; /* Default hide all calendars */
    font-size: 15px;
}

table {
    width: 100%;
    border-collapse: collapse;
    margin-bottom: 20px;
    background-color: #fff;
}

thead {
    background-color: #f0f0f0;
}

thead th {
    text-align: left;
    padding: 10px;
}

tbody tr td {
    padding: 10px;
    border: 1px solid #ddd;
}

tbody tr:nth-child(odd) {
    background-color: #f9f9f9;
}

/* Responsive Design */
@media screen and (max-width: 768px) {
    .container {
        flex-direction: column;
    }

    .sidebar {
        width: 100%;
        margin-bottom: 20px;
    }

    .content {
        width: 100%;
    }
}