Smart select - Don't work!

I’ve got a problem with Smart select. I tried the example on Framework 7 v4.5.0 Docs, provided by link:

As you can see in the attached photo, all the option tag display a line, and I cannot see the value.
What can I do? I need some help, Thank You.

Please post the code you have written. It will be easier to get help that way

The HTML code is the following:

<div class="list">
          <a class="item-link smart-select smart-select-init">
            <select name="fruits">
              <option value="apple" selected>Apple</option>
              <option value="pineapple">Pineapple</option>
              <option value="pear">Pear</option>
              <option value="orange">Orange</option>
              <option value="melon">Melon</option>
              <option value="peach">Peach</option>
              <option value="banana">Banana</option>
            <div class="item-content">
              <div class="item-inner">
                <div class="item-title">Fruit</div>