html,
body {
    background: url("../img/background_login.jpg") center center no-repeat;
    background-size: cover;
    height: 100%;
}

.form-signin {
    width: 100%;
    max-width: 330px;
    border-radius: .3rem;
    background-color: rgba(255,255,255,0.9);
}

.form-signin input {
    position: relative;
    box-sizing: border-box;
    height: auto;
    padding: 10px;
    font-size: 16px;
}

.form-signin input:focus {
    z-index: 2;
}

.form-signin input:nth-of-type(1) {
    margin-bottom: -1px;
    border-bottom-right-radius: 0;
    border-bottom-left-radius: 0;
}

.form-signin input:nth-of-type(2) {
    margin-bottom: 10px;
    border-top-left-radius: 0;
    border-top-right-radius: 0;
}