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<div class="w-container container-content">
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            <h3 class="calendar_title">
<svg width="18" height="18" viewBox="0 0 24 24">    <path d="M12,14.071L8.179,10.25c-0.414-0.414-1.086-0.414-1.5,0l0,0c-0.414,0.414-0.414,1.086,0,1.5l4.614,4.614 c0.391,0.391,1.024,0.391,1.414,0l4.614-4.614c0.414-0.414,0.414-1.086,0-1.5v0c-0.414-0.414-1.086-0.414-1.5,0L12,14.071z"></path></svg>September 2020</h3>
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                <span>Mon</span>
                <span>Tue</span>
                <span>Wed</span>
                <span>Thu</span>
                <span>Fri</span>
                <span>Sat</span>
                <span>Sun</span>
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                <a>
                  <span class="v-day">31</span>
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                <a>
                  <span>1</span>
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                <a>
                  <span>2</span>
                </a>
                <a>
                  <span>3</span>
                </a>
                <a>
                  <span>4</span>
                </a>
                <a>
                  <span>5</span>
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                <a>
                  <span>6</span>
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                  <span>9</span>
                </a>
                <a>
                  <span>10</span>
                </a>
                <a>
                  <span>11</span>
                </a>
                <a>
                  <span>12</span>
                </a>
                <a>
                  <span>13</span>
                </a>
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                  <span>14
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                      <span class="dot color-orange"></span>
                      <span class="dot color-blue"></span>
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                <a href="#2">
                  <span>15</span>
                </a>
                <a href="#3">
                  <span>16
                    <span class="dots">
                      <span class="dot color-blue"></span>
                    </span>
                  </span>
                </a>
                <a href="#4">
                  <span>17
                    <span class="dots">
                      <span class="dot color-blue"></span>
                      <span class="dot color-pink"></span>
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                <a href="#5">
                  <span>18</span>
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                <a href="#6">
                  <span>19</span>
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                  <span>20
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                <a>
                  <span>21</span>
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                <a>
                  <span>22</span>
                </a>
                <a>
                  <span>23</span>
                </a>
                <a>
                  <span>24</span>
                </a>
                <a>
                  <span>25</span>
                </a>
                <a>
                  <span>26</span>
                </a>
                <a>
                  <span>27</span>
                </a>
              </div>
              <div class="v-list">
                <a>
                  <span>28</span>
                </a>
                <a>
                  <span>29</span>
                </a>
                <a>
                  <span>30</span>
                </a>
                <a>
                  <span class="v-day">1</span>
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                <a>
                  <span class="v-day">2</span>
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                <a>
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                <a>
                  <span class="v-day">4</span>
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        <div class="v-info">
          <section id="1" class="v-section">
            <p class="v-section_item">
              <span class="v-section_line color-orange"></span>
              <span class="v-section_time">9:00 pm</span>
              Complete birthday party preparations: buy baloons and chocolate.

            </p>
            <p class="v-section_item">
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              <span class="v-section_time">12:45 pm</span>
              Watch series.
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              Video calling with Tom.
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              Buy theater tickets
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              Register for an online painting lesson
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              Learn Javascript
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              <span class="v-section_time">12:00 pm</span>
              Prepare tasty chicken for dinner.
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              Prepare tasty chicken for dinner.
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              <span class="v-section_line color-orange"></span>
              <span class="v-section_time">12:00 pm</span>
              Prepare tasty chicken for dinner.
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            <p class="v-section_item">
              <span class="v-section_line color-blue"></span>
              <span class="v-section_time">12:00 pm</span>
              Prepare tasty chicken for dinner.
            </p>
                   <p class="v-section_item">
              <span class="v-section_line color-blue"></span>
              <span class="v-section_time">12:00 pm</span>
               Complete birthday party preparations: buy baloons and chocolate.

            </p>
                   <p class="v-section_item">
              <span class="v-section_line color-blue"></span>
              <span class="v-section_time">12:00 pm</span>
               Complete birthday party preparations: buy baloons and chocolate.

            </p>
                   <p class="v-section_item">
              <span class="v-section_line color-blue"></span>
              <span class="v-section_time">12:00 pm</span>
               Complete birthday party preparations: buy baloons and chocolate.

            </p>
            <p class="v-section_item">
              <span class="v-section_line color-blue"></span>
              <span class="v-section_time">12:00 pm</span>
               Complete birthday party preparations: buy baloons and chocolate.

            </p>
            <p class="v-section_item">
              <span class="v-section_line color-green"></span>
              <span class="v-section_time">12:00 pm</span>
               Complete birthday party preparations: buy baloons and chocolate.

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  fill: #fff
View Compiled
  let calendar = document.querySelector('.v-calendar');

  $(".calendar").on('click', function () {
    $(".v-calendar").addClass('mini');
  });

  var sections = $('section')
    , nav = $('.calendar');

  $(".v-info").on('scroll', function () {
    if ($(".v-info").scrollTop() > 0) {
      $(".v-calendar").addClass('mini');
    } else {
      $(".v-calendar").removeClass('mini');
    }

    let calendarRect = calendar.getBoundingClientRect();
    let curPos = calendarRect.top + calendarRect.height;

    sections.each(function() {
      let rect = this.getBoundingClientRect();
      let style = window.getComputedStyle(this);
      let top = rect.top - parseInt(style['margin-top'], 10);
      let bottom = rect.bottom;
    
      if (curPos >= top && curPos <= bottom) {
        nav.find('a').removeClass('active');
        sections.removeClass('active');

        $(this).addClass('active');
        nav.find('a[href="#'+$(this).attr('id')+'"]').addClass('active');
      }
    });
  });
  
  nav.find('a').on('click', function () {
    var $el = $(this)
    , id = $el.attr('href');
    
    $(".v-info").animate({
      scrollTop: $(id).offset().top
    }, 500);
    
    return false;
  });

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External JavaScript

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