JSFiddle - React, Tailwind, and code Playground

HTML

<a id="umustlogin">An Error ocurred<br/><div>Please login<br /><input type="text"/><br/><input type="password"/><br/><button>Submit</button></div></a>

CSS

@import url(http://fonts.googleapis.com/css?family=Open+Sans+Condensed:300);
 body {
    margin: 0;
    padding: 0;
    background: url('http://i.imgur.com/28TDYC5.gif') #000;
    width: 100%;
    height: 100%;
    background-size: cover;
    background-repeat: no-repeat;
    text-shadow: 0px 1px 2px rgba(0,0,0,.5);
}
#umustlogin {
    position: absolute;
    overflow: hidden;
    left: 0;
    top: 0;
    width: 100vw;
    height: 100vh;
    color: #fff;
    background: rgba(220, 0, 0, .8);
    text-align: center;
    line-height: 100vh;
    -webkit-clip-path: circle(60px);
    transition: all 1s;
    text-decoration: none;
    text-align: center;
    font-family:'Open Sans Condensed';
    font-weight: bold;
    cursor: pointer;
}
input, button {
    font-family:'Open Sans';
    font-weight: 300;
}
#umustlogin.selected {
    line-height: 10vh;
    -webkit-clip-path: circle(100vw);
    background: rgba(220, 0, 0, .3);
}
div {

}
button {
    background: #fff;
    border: 1px solid #ddd;
    padding: .5vw 1vw;
    outline: none;
    margin: 2vw;
    cursor: pointer;
}

JavaScript

$('#umustlogin').on('click', function () {
    $(this).toggleClass('selected');
}).children().click(function (e) {
    return false;
});