JSFiddle - React, Tailwind, and code Playground

HTML

<link rel="stylesheet" href="http://netdna.bootstrapcdn.com/twitter-bootstrap/2.3.2/css/bootstrap-combined.min.css">
<div class="frame">
    <div class="alpha">
    <div class="wrapper">
    <div class="wrap-input">
        <input class="input-block-level" type="text" placeholder="username"></input>
    </div>
    <div class="wrap-input">
        <input class="input-block-level" type="text" placeholder="password"></input>
    </div>
</div>
<button class="btn">test</button>
</div>
</div>

CSS

.frame {
    background: url(http://lorempixel.com/g/400/200) no-repeat;
    width: 360px;
    position: relative;
}
.frame .alpha {
    padding: 50px 80px;
    background: rgba(0,0,0,0.9);
}

input[type="text"] {
    display: block;
    margin: 0;
    border: none;
    border-radius: 0;
}
button {
    margin-top: 10px;
}
.wrapper {
    float: left;
    border: 1px solid lightgrey;
    display: block;
    margin-bottom: 10px;
}
.wrap-input {
    float: left
    display: block;
    width: 100%;
}
.btn {
    clear: both;
    display: block;
    font-weight: 200;
    text-shadow: none;
    color: white;
    background: none !important;
    background-color: orange !important;
    box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.5), inset 0 -1px 0 rgba(0, 0, 0, 0.2) !important;
    border: 1px solid rgba(0, 0, 0, 0.1);
}