Customize the UI appearance of the control in ASP.NET Core MaskedTextBox control

<ejs-maskedtextbox id="mask1" name="mask_value1" mask="00000" value='42648' placeholder="Enter user ID" cssClass="e-style" floatLabelType="Always" focus="onfocus.bind(this)"></ejs-maskedtextbox>
<script>
    function onfocus(args) {
        args.selectionEnd = args.selectionStart;
    }
</script>

<style>
    .e-mask.e-style .e-control.e-maskedtextbox {
        color: #00ffff;
        letter-spacing: 10px;
        font-size: xx-large;
        border: 1px;
        border-color: #ffffff;
    }

    .e-control-wrapper.e-mask.e-float-input.e-style .e-float-line::before {
        background: #ffffff;
    }

    .e-control-wrapper.e-mask.e-float-input.e-style .e-float-line::after {
        background: #ffffff;
    }

    .e-control-wrapper.e-mask.e-float-input.e-style .e-float-text.e-label-top {
        color: #00ffff;
        font-size: medium;
    }
</style>

public ActionResult customCss()
{
    return View();
}