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HTML

<select>
<optgroup style="max-height: 40px; background-color:green">
  <option value="" style="display:none">Choose one provider</option>
  <option value="one">Option 1</option>
  <option value="two">Option 2</option>
  <option value="two">Option 2</option>
  <option value="two">Option 2</option>
  <option value="two">Option 2</option>
  <option value="two">Option 2</option>
  <option value="two">Option 2</option>
  <option value="two">Option 2</option>
  <option value="two">Option 2</option>
  <option value="two">Option 2</option></optgroup>
<option value="two">Option 2</option>
<option value="two">Option 2</option>
  <option value="two">Option 2</option>
<option value="one">Option 1</option>
  <option value="two">Option 2</option>
  <option value="two">Option 2</option>
  <option value="two">Option 2</option>
  <option value="two">Option 2</option>
  <option value="two">Option 2</option>
  <option value="two">Option 2</option>
  <option value="two">Option 2</option>
  <option value="two">Option 2</option>
  <option value="two">Option 2</option>
<option value="two">Option 2</option>
<option value="two">Option 2</option>
  <option value="two">Option 2</option><option value="one">Option 1</option>
  <option value="two">Option 2</option>
  <option value="two">Option 2</option>
  <option value="two">Option 2</option>
  <option value="two">Option 2</option>
  <option value="two">Option 2</option>
  <option value="two">Option 2</option>
  <option value="two">Option 2</option>
  <option value="two">Option 2</option>
  <option value="two">Option 2</option>
<option value="two">Option 2</option>
<option value="two">Option 2</option>
  <option value="two">Option 2</option><option value="one">Option 1</option>
  <option value="two">Option 2</option>
  <option value="two">Option 2</option>
  <option value="two">Option 2</option>
  <option value="two">Option 2</option>
  <option value="two">Option 2</option>
  <option value="two">Option 2</option>
  <option value="two">Option...