A switch has the markup of a custom checkbox but uses the .form-switch class to render a toggle switch. Switches also support the disabled attribute.
<div class="set-default-btn mr-auto">
<span class="toggle-btn">
<label class="switch"><input type="checkbox"><span class="slider round"></span></label>
</span><span class="set-default-lbl">Normal</span>
</div>
<div class="set-default-btn mr-auto">
<span class="toggle-btn">
<label class="switch"><input type="checkbox" checked=""><span class="slider round"></span></label>
</span><span class="set-default-lbl">Checked</span>
</div>
<div class="set-default-btn mr-auto">
<span class="toggle-btn">
<label class="switch"><input type="checkbox" disabled=""><span class="slider round"></span></label>
</span><span class="set-default-lbl">Disabled</span>
</div>
<div class="set-default-btn mr-auto">
<span class="toggle-btn">
<label class="switch"><input type="checkbox" checked="" disabled=""><span class="slider round"></span></label>
</span><span class="set-default-lbl">Checked disabled</span>
</div>