JSFiddle - React, Tailwind, and code Playground

by Moor

HTML

<div id="footer-subscribe-block-inner" class="clearfix">
    <div id="subscribe-email-bg">
        <input id="subscribe-email" type="email" placeholder="[email protected]" />
    </div>
    <button type="submit" id="subscribe-submit" onClick="javascript:omgemailgone();">></button>
</div>

CSS

#footer-subscribe-block-inner {
    background-color:#FE975F;
    color:#FFF;
    font-size:90%;
    padding:24px;
    min-height:102px;
}
#footer-subscribe-block-inner #subscribe-email-bg {
    float:left;
    height:30px;
    width:138px;
    position:relative;
    background:#FFF;
}
#footer-subscribe-block-inner #subscribe-email-bg.gone {
    background:#F7C0A3;
}
#footer-subscribe-block-inner #subscribe-email {
    position:absolute;
    top:0;
    height:30px;
    width:130px;
    font-family:'PT Sans Narrow', mono;
    font-size:14px;
    color:#222;
    border:none;
    line-height:20px;
    padding:0 4px;
}
#footer-subscribe-block-inner #subscribe-email.gone {
    top:-120px;
    -ms-filter:"progid:DXImageTransform.Microsoft.Alpha(Opacity=0)";
    filter: alpha(opacity=0);
    opacity: 0;
    -webkit-transform:matrix(2, 0, 0, 0, 0, 0);
    -moz-transform:matrix(2, 0, 0, 0, 0, 0);
    -o-transform:matrix(2, 0, 0, 0, 0, 0);
    -ms-transform:matrix(2, 0, 0, 0, 0, 0);
    transform:matrix(2, 0, 0, 0, 0, 0);
    filter: progid:DXImageTransform.Microsoft.Matrix(M11=2, M12=0, M21=0, M22=0, Dx=0, Dy=0);
    -webkit-transition: all 0.5s;
    -moz-transition: all 0.5s;
    -o-transition: all 0.5s;
    -ms-transition: all 0.5s;
    transition: all 0.5s;
}
#footer-subscribe-block-inner #subscribe-email::-webkit-input-placeholder {
    font-style:italic;
    color:#777;
}
#footer-subscribe-block-inner #subscribe-email:-moz-placeholder {
    font-style:italic;
    color:#777;
}
#footer-subscribe-block-inner #subscribe-submit {
    height:30px;
    background:url(/assets/img/arrow-right.png) center center no-repeat #9D62A5;
    float:left;
    width:30px;
    -webkit-transition: all 0.4s;
    -moz-transition: all 0.4s;
    -ms-transition: all 0.4s;
    -o-transition: all 0.4s;
    transition: all 0.4s;
    border:none;
}
#footer-subscribe-block-inner #subscribe-submit:hover {
    background-color:#7F3D88;
}

JavaScript

function omgemailgone() {
    if (!document.getElementById("subscribe-email").checkValidity()) {
        document.getElementById("subscribe-email").setAttribute("class", "gone");
        document.getElementById("subscribe-email-bg").setAttribute("class", "gone");
        alert("input not valid!");
    }
}