<div class="dropdown">
  <button class="btn btn-outline-secondary dropdown-toggle text-dark" type="button" id="eventFilterDropdown" data-bs-toggle="dropdown" aria-expanded="false">
    Próximos 30 dias
  </button>
  <ul class="dropdown-menu dropdown-menu-custom" aria-labelledby="eventFilterDropdown">
    <li>
      <div class="calendar-container">

        <div class="calendar-column">
          <div class="calendar-header">
            <span class="month-circle"></span>
            <div class="month-year">
              <span class="month">set.</span>
              <span class="year">2024</span>
            </div>
            <span class="month-circle"></span>
          </div>
          <div class="calendar-days">
            <span>Dom</span><span>Seg</span><span>Ter</span><span>Qua</span><span>Qui</span><span>Sex</span><span>Sab</span>
          </div>
          <div class="calendar">
            <div class="day">1</div><div class="day">2</div><div class="day">3</div>
            ...
            <div class="day selected">30</div>
          </div>
        </div>

        <div class="calendar-column">
          <div class="calendar-header">
            <span class="month-circle"></span>
            <div class="month-year">
              <span class="month">out.</span>
              <span class="year">2024</span>
            </div>
            <span class="month-circle"></span>
          </div>
          <div class="calendar-days">
            <span>Dom</span><span>Seg</span><span>Ter</span><span>Qua</span><span>Qui</span><span>Sex</span><span>Sab</span>
          </div>
          <div class="calendar">
            <div class="day">1</div><div class="day">2</div><div class="day">3</div>
            ...
            <div class="day">31</div>
          </div>
        </div>

        <div class="sidebar-options">
          <button class="option-button">Hoje</button>
          <button class="option-button">Amanhã</button>
          <button class="option-button">Esta semana</button>
          <button class="option-button">Este fim de semana</button>
          <button class="option-button">Este mês</button>
          <button class="option-button">Próximo fim de semana</button>
          <button class="option-button">Próximos 7 dias</button>
          <button class="option-button">Próximos 30 dias</button>
          <button class="option-button">Outubro</button>
          <button class="option-button">2024</button>
        </div>
      </div>
    </li>
  </ul>
</div>