<link rel="stylesheet" href="https://raw.githubusercontent.com/jaypy-code/calendar-js/master/example/style.css" />
    <script src="https://raw.githubusercontent.com/jaypy-code/calendar-js/master/dist/bundle.js"></script>
    <div id="calendar"></div>
    <script>
        let calendar = new window.Calendar('#calendar');
        let options = { 
            year: ,
            month: ,
            on: { 
                day: function(day='') {},
                label: function(label={}) {}
            },
            labels: { 
                '1': { text: 'First day of month', class: 'blue' },
                '15': { text: 'New Label', class: 'red' }
            }
        };
        calendar.make(options);
    </script>