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HTML

<select name="dark_background" style="background:#002B36;color:#93A1A1">
    <option value="#B58900" style="background:#002B36;color:#B58900">Yellow</option>
    <option value="#CB4B16" style="background:#002B36;color:#CB4B16">Orange</option>
    <option value="#DC322F" style="background:#002B36;color:#DC322F">Red</option>
    <option value="#D33682" style="background:#002B36;color:#D33682">Magenta</option>
    <option value="#6C71C4" style="background:#002B36;color:#6C71C4">Violet</option>
    <option value="#268BD2" style="background:#002B36;color:#268BD2">Blue</option>
    <option value="#2AA198" style="background:#002B36;color:#2AA198">Cyan</option>
    <option value="#859900" style="background:#002B36;color:#859900">Green</option>
</select>


<select name="light_background" style="background:#FDF6E3;color:#93A1A1">
    <option value="#B58900" style="background:#FDF6E3;color:#B58900">Yellow</option>
    <option value="#CB4B16" style="background:#FDF6E3;color:#CB4B16">Orange</option>
    <option value="#DC322F" style="background:#FDF6E3;color:#DC322F">Red</option>
    <option value="#D33682" style="background:#FDF6E3;color:#D33682">Magenta</option>
    <option value="#6C71C4" style="background:#FDF6E3;color:#6C71C4">Violet</option>
    <option value="#268BD2" style="background:#FDF6E3;color:#268BD2">Blue</option>
    <option value="#2AA198" style="background:#FDF6E3;color:#2AA198">Cyan</option>
    <option value="#859900" style="background:#FDF6E3;color:#859900">Green</option>
</select>