JSFiddle - React, Tailwind, and code Playground

HTML

<script src="https://code.jquery.com/jquery-1.12.4.js"></script>
<script src="https://code.jquery.com/ui/1.12.1/jquery-ui.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery.inputmask/3.1.62/jquery.inputmask.bundle.js"></script>
<script> 
$(window).load(function()
{
   var phones = [{ "mask": "# ### ## ###"}, { "mask": "# ### ## ###"}];
    $('#phone').inputmask({ 
        mask: phones, 
        greedy: false, 
        definitions: { '#': { validator: "[0-9]", cardinality: 1}} });
});
</script>
<label for="phone" class="first-col">Mobile No.:</label>
<input type="text" id="phone" placeholder="8 600 00 000" required pattern="(86)\d{7}" />

CSS

input:required:valid {
	box-shadow: 0 0 5px #5cd053;
	border-color: #28921f;
}