* {
    margin: 0;
    padding: 0;
    font-family: sans-serif;
    box-sizing: border-box;
}

body {
    background-image: url(../images/20141101_092220_1.jpg);
    background-repeat: no-repeat;
    background-position: center center;
    background-size: cover;
    display: flex;
    min-height: 100vh;
}

form {
    margin: auto;
    width: 50%;
    max-width: 500px;
    background-color: rgba(255,255,255,.15);
    padding: 30px;
}

h2 {
    text-align: center;
    margin-bottom: 20px;
    color: rgba(0,0,0,3);
}

input {
    display: block;
    padding: 10px;
    width: 100%;
    margin: 15px 0;
    font-size: 15px;
}

    input[type="submit"] {
        background: linear-gradient(#FFDA63, #FFB940);
    }