JSFiddle - React, Tailwind, and code Playground

HTML

<div class="u-loading">
<div class="address-container u-border-all">
    <input type="text"  class="address__textbox address__textbox--line u-border-bottom">
    <input type="text"  class="address__textbox address__textbox--house-no u-border-right">
    <input type="text" class="address__textbox address__textbox--street">
    <input type="text"  class="address__textbox address__textbox--line">
    <input type="text" class="address__textbox address__textbox--line">
    <input type="text" class="address__textbox address__textbox--line">
    <input type="text"  class="address__textbox address__textbox--postcode u-border-right u-border-top">
    <select class="address__textbox address__country u-border-top">
        <option value="Select a country" selected="selected" class="rps-placeholder">Select a country</option>
        <option value="England">England</option>
        <option value="Wales">Wales</option>
        <option value="Scotland">Scotland</option>
    </select>
</div>
</div>

CSS

/*------------------------------------*\
    ##Loading
\*------------------------------------*/


/* Absolute Center CSS Spinner */
.u-loading {
    position: fixed;
    left: 0px;
    top: 0px;
    width: 100%;
    height: 100%;
    z-index: 9999;
}


.u-loading:not(:required):after {
    width: 100%;
    height: 100%;
    z-index: 9999;
    overflow: visible;
    position: relative;
    content: '';
    display: inherit;
    font-size: 10px;
    width: 1em;
    height: 1em;
    margin: 0 auto;
    -webkit-animation: spinner 1500ms infinite linear;
    -moz-animation: spinner 1500ms infinite linear;
    -ms-animation: spinner 1500ms infinite linear;
    -o-animation: spinner 1500ms infinite linear;
    animation: spinner 1500ms infinite linear;
    border-radius: 0.5em;
    -webkit-box-shadow: rgba(0, 0, 0, 0.75) 1.5em 0 0 0, rgba(0, 0, 0, 0.75) 1.1em 1.1em 0 0, rgba(0, 0, 0, 0.75) 0 1.5em 0 0, rgba(0, 0, 0, 0.75) -1.1em 1.1em 0 0, rgba(0, 0, 0, 0.5) -1.5em 0 0 0, rgba(0, 0, 0, 0.5) -1.1em -1.1em 0 0, rgba(0, 0, 0, 0.75) 0 -1.5em 0 0, rgba(0, 0, 0, 0.75) 1.1em -1.1em 0 0;
    box-shadow: rgba(0, 0, 0, 0.75) 1.5em 0 0 0, rgba(0, 0, 0, 0.75) 1.1em 1.1em 0 0, rgba(0, 0, 0, 0.75) 0 1.5em 0 0, rgba(0, 0, 0, 0.75) -1.1em 1.1em 0 0, rgba(0, 0, 0, 0.75) -1.5em 0 0 0, rgba(0, 0, 0, 0.75) -1.1em -1.1em 0 0, rgba(0, 0, 0, 0.75) 0 -1.5em 0 0, rgba(0, 0, 0, 0.75) 1.1em -1.1em 0 0;
}

/* Animation */

@-webkit-keyframes spinner {
    0% {
        -webkit-transform: rotate(0deg);
        -moz-transform: rotate(0deg);
        -ms-transform: rotate(0deg);
        -o-transform: rotate(0deg);
        transform: rotate(0deg);
    }
    100% {
        -webkit-transform: rotate(360deg);
        -moz-transform: rotate(360deg);
        -ms-transform: rotate(360deg);
        -o-transform: rotate(360deg);
        transform: rotate(360deg);
    }
}
@-moz-keyframes spinner {
    0% {
        -webkit-transform: rotate(0deg);
        -moz-transform: rotate(0deg);
        -ms-transform:...