Dark Mode Calendar

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Dark Mode Calendar</title>
    <link rel="stylesheet" href="https://cdnjs.cloudflare.com/ajax/libs/font-awesome/5.15.3/css/all.min.css">
    <style>
        body {
            font-family: 'Arial', sans-serif;
            background: #222;
            display: flex;
            justify-content: center;
            align-items: center;
            height: 100vh;
            margin: 0;
        }
        .calendar {
            background: #333;
            border-radius: 8px;
            box-shadow: 0 2px 10px rgba(0,0,0,0.1);
            overflow: hidden;
            width: 300px;
            color: white;
        }
        .calendar-header {
            background: #444;
            color: white;
            text-align: center;
            padding: 10px;
            font-size: 18px;
        }
        .calendar-header h2 {
            margin: 0;
            font-size: 1.5em;
        }
        .calendar-header select {
            background: #444;
            border: none;
            color: white;
            font-size: 1em;
            margin: 0 5px;
            padding: 5px;
        }
        .calendar-header button {
            background: none;
            border: none;
            color: white;
            cursor: pointer;
            font-size: 1.2em;
        }
        .calendar-header button:focus {
            outline: none;
        }
        .calendar-body {
            display: grid;
            grid-template-columns: repeat(7, 1fr);
            gap: 5px;
            padding: 10px;
        }
        .calendar-day {
            width: 30px;
            height: 30px;
            display: flex;
            justify-content: center;
            align-items: center;
            border-radius: 50%;
            cursor: pointer;
            transition: background 0.3s, transform 0.3s;
        }
        .calendar-day:hover {
            background: #555;
            transform: scale(1.1);
        }
        .calendar-day.active {
            background: #666;
            color: white;
        }
        .calendar-day span {
            font-size: 0.9em;
        }
        .calendar-footer {
            text-align: center;
            padding: 10px;
            font-size: 14px;
        }
        .calendar-footer button {
            background: #444;
            border: none;
            color: white;
            cursor: pointer;
            font-size: 1em;
            padding: 5px 15px;
            border-radius: 5px;
            transition: background 0.3s;
        }
        .calendar-footer button:hover {
            background: #555;
        }
    </style>
</head>
<body>
<div class="calendar">
    <div class="calendar-header">
        <button type="button" id="prevMonth" title="Previous"><i class="fas fa-chevron-left"></i></button>
        <select id="monthSelect" title="Month"></select>
        <select id="yearSelect" title="Year"></select>
        <button type="button" id="nextMonth" title="Next"><i class="fas fa-chevron-right"></i></button>
    </div>
    <div class="calendar-body" id="calendarBody"></div>
    <div class="calendar-footer">
        <button type="button" id="todayBtn">Today</button>
    </div>
</div>
<script>
    const calendarBody = document.getElementById('calendarBody');
    const monthSelect = document.getElementById('monthSelect');
    const yearSelect = document.getElementById('yearSelect');
    const prevMonth = document.getElementById('prevMonth');
    const nextMonth = document.getElementById('nextMonth');
    const todayBtn = document.getElementById('todayBtn');
    let currentDate = new Date();
    const months = [
        'January', 'February', 'March', 'April', 'May', 'June',
        'July', 'August', 'September', 'October', 'November', 'December'
    ];
    function populateMonthSelect() {
        months.forEach((month, index) => {
            const option = document.createElement('option');
            option.value = index;
            option.textContent = month;
            monthSelect.appendChild(option);
        });
    }
    function populateYearSelect() {
        const currentYear = new Date().getFullYear();
        for (let i = currentYear - 50; i <= currentYear + 50; i++) {
            const option = document.createElement('option');
            option.value = i;
            option.textContent = i;
            yearSelect.appendChild(option);
        }
    }
    function renderCalendar(date) {
        const year = date.getFullYear();
        const month = date.getMonth();
        const firstDayOfMonth = new Date(year, month, 1).getDay();
        const lastDateOfMonth = new Date(year, month + 1, 0).getDate();
        const lastDayOfLastMonth = new Date(year, month, 0).getDate();
        monthSelect.value = month;
        yearSelect.value = year;
        calendarBody.innerHTML = '';
        for (let i = firstDayOfMonth; i > 0; i--) {
            calendarBody.innerHTML += `<div class="calendar-day inactive">${lastDayOfLastMonth - i + 1}</div>`;
        }
        for (let i = 1; i <= lastDateOfMonth; i++) {
            calendarBody.innerHTML += `<div class="calendar-day ${i === date.getDate() ? 'active' : ''}"><span>${i}</span></div>`;
        }
        const totalDays = firstDayOfMonth + lastDateOfMonth;
        const nextDays = 7 - (totalDays % 7);
        for (let i = 1; i <= nextDays; i++) {
            calendarBody.innerHTML += `<div class="calendar-day inactive">${i}</div>`;
        }
    }
    prevMonth.addEventListener('click', () => {
        currentDate.setMonth(currentDate.getMonth() - 1);
        renderCalendar(currentDate);
    });
    nextMonth.addEventListener('click', () => {
        currentDate.setMonth(currentDate.getMonth() + 1);
        renderCalendar(currentDate);
    });
    monthSelect.addEventListener('change', (e) => {
        currentDate.setMonth(e.target.value);
        renderCalendar(currentDate);
    });
    yearSelect.addEventListener('change', (e) => {
        currentDate.setFullYear(e.target.value);
        renderCalendar(currentDate);
    });
    todayBtn.addEventListener('click', () => {
        currentDate = new Date();
        renderCalendar(currentDate);
    });
    populateMonthSelect();
    populateYearSelect();
    renderCalendar(currentDate);
</script>
</body>
</html>

Dark Mode Calendar - VexaX