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HTML

<select name="select_projects" id="select_projects">
    <option value="">project.xml</option>
    <optgroup label="client1">
        <option value="">project2.xml</option>
    </optgroup>
    <optgroup label="client2">
        <option value="">project5.xml</option>
        <option value="">project6.xml</option>
        <optgroup label="client2_a">
            <option value="">project7.xml</option>
            <option value="">project8.xml</option>
        </optgroup>
        <option value="">project3.xml</option>
        <option value="">project4.xml</option>
   </optgroup>
   <option value="">project0.xml</option>
   <option value="">project1.xml</option>
</select>

CSS

select {width:50%;}
optgroup { margin-left:20px; }

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JSFiddle - React, Tailwind, and code Playground

HTML

CSS

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