html,
/*body {
    height: 100%;
}

body {
    display: grid;
    align-items: center;
    padding-top: 40px;
    padding-bottom: 40px;
    background-image: url(../../img/backgrounds/background_uam.png);
    background-attachment: fixed;
    background-position: 50% 50%;*/ /* or: center center */
    /*background-size: cover;
}*/

.styled-element {
    display: grid;
    align-items: center;
    padding-top: 40px;
    padding-bottom: 40px;
    background-image: url(../../img/backgrounds/background_uam.png);
    background-attachment: fixed;
    background-position: 50% 50%; /* or: center center */
    background-size: cover;
    height: 100%;
}

.form-group {
    margin-bottom: 0rem;
}

.form-signin {
    width: 100%;
    max-width: 450px;
    margin: auto;

}

    .form-signin input {
        padding: 10% 0;
        margin: 0px 0px;
        text-align: center;
    }

    .form-signin .btn {
        padding: 5% 0;
        margin: 0.5px 0px;
    }

.title-access {
    color: #FFFFFF;
}

button#btnLogin {
    background: #66B8C0;
    color: #4D4D4F;
}

a#btnRegister {
    background: #DCCA9F;
    color: #4D4D4F;
    border-color: #DCCA9F;
}

.text-copyright {
    color: white;
    line-height: 1em;
}