Full Page Invitation Templates Responsive

Get invited box full screen design

<form id="header-signup" class="signup-form untouched">
    <input type="email" placeholder="email" title="A valid email, please" name="email" class="validate-email " />
    <input type="submit" value="Get Invited" class="" />
</form>

body {
    font-weight: 400;
    background: url(http://lorempixel.com/1200/900/business/6/);
    -webkit-background-size: cover;
    -moz-background-size: cover;
    -o-background-size: cover;
    background-size: cover;
    background-position: 100% 100%;
    background-position: 100% 50%;
    overflow: hidden;
    position: relative;
    height: 55%;
    min-height: 500px;
    max-height: 585px;
    text-align: center;
    margin-top: 20%;
}
input {
    border: none;
    outline: none;
    background: white;
    -webkit-appearance: none;
    font-size: 14px;
    font-weight: 500;
    color: #3e474c;
    line-height: 1em;
    padding: 1em 1.1em;
    -webkit-border-radius: 0.25em;
    -moz-border-radius: 0.25em;
    -ms-border-radius: 0.25em;
    -o-border-radius: 0.25em;
    border-radius: 0.25em;
}
#header-signup {
    -webkit-border-radius: 5px;
    -moz-border-radius: 5px;
    -ms-border-radius: 5px;
    -o-border-radius: 5px;
    border-radius: 5px;
    background: rgba(255, 255, 255, 0.3);
    padding: 12px;
    margin: 0 auto 1em auto;
    display: inline-block;
}
input[type=submit] {
    display: inline-block;
    margin-left: 6px;
    margin-top: 0;
    width: auto;
    background: #e96e57;
}
input[type=submit] {
    display: inline-block;
    padding: 1em 1.5em;
    -webkit-border-radius: 3px;
    -moz-border-radius: 3px;
    -ms-border-radius: 3px;
    -o-border-radius: 3px;
    border-radius: 3px;
    font-size: 13px;
    text-transform: uppercase;
    font-weight: 500;
    letter-spacing: 1px;
    line-height: 13px;
    text-align: center;
    text-decoration: none;
    border: 0;
    -webkit-transition: background 0.2s;
    -moz-transition: background 0.2s;
    -o-transition: background 0.2s;
    transition: background 0.2s;
    color: white;
    white-space: nowrap;
    cursor: default;
}
input[type=submit]:hover {
    background: #d5645a;
}

DEMO