<select class="kleon-select-simple">
    <option value="0">Daily</option>
    <option value="1">Weekly</option>
    <option value="2">Monthly</option>
    <option value="3">Yearly</option>
</select>

<select class="kleon-select-simple">
    <option value="0">Daily</option>
    <option value="1">Weekly</option>
    <option value="2" disabled="disabled">Monthly</option>
    <option value="3">Yearly</option>
</select>

<select class="kleon-select-simple" multiple="multiple">
    <option value="0">Daily</option>
    <option value="1">Weekly</option>
    <option value="2">Monthly</option>
    <option value="3">Yearly</option>
</select>

<select class="kleon-select-simple">
    <optgroup label="Group One">
        <option value="0">Daily</option>
        <option value="1">Weekly</option>
    </optgroup>
    <optgroup label="Group Two">
        <option value="2">Monthly</option>
        <option value="3">Yearly</option>
    </optgroup>
</select>

<select class="kleon-select-ajax form-control"></select>

<select class="kleon-select-single nav-toggler-content">
    <option selected value="en">Eng(US)</option>
    <option value="fr">French</option>
    <option value="de">German</option>
    <option value="sp">Spanish</option>
</select>

<select class="kleon-select-auto">
    <option value="0">Daily</option>
    <option value="1">Weekly</option>
    <option value="2">Monthly</option>
    <option value="3">Yearly</option>
</select>

<select class="kleon-select-placeholder form-control">
    <option value="0">Daily</option>
    <option value="1">Weekly</option>
    <option value="2">Monthly</option>
    <option value="3">Yearly</option>
</select>