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不是用 px 固定选择下拉菜单的宽度，而是可以根据所选选项动态更改选择框的宽度。因此，例如根据选择框将调整大小的日期。

  <select name="day"  class="activity-filter"  >
        <option value="/customer/8708?day=Any+Day">Any Day</option>
        <option value="/customer/8708?day=Mon">Monday</option>
        <option value="/customer/8708?day=Tue">Tuesday</option>
        <option value="/customer/8708?day=Wed">Wednesday</option>
        <option value="/customer/8708?day=Thu">Thursday</option>
        <option value="/customer/8708?day=Fri">Friday</option>
        <option value="/customer/8708?day=Sat">Saturday</option>
        <option value="/customer/8708?day=Sun">Sunday</option>
      </select>
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