Html select tag using in post/page, arrow is missing

I add  a select list to my website. But the arrow is missing. Why I dont understand. I try another free theme and arrow is shown. What is the possible issue? What I missing? The example select list preview:

image
My test code:
<select>
  <option value="volvo">Volvo</option>
  <option value="saab">Saab</option>
  <option value="mercedes">Mercedes</option>
  <option value="audi">Audi</option>
</select>

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