.centrar {
    position: absolute;
    /*nos posicionamos en el centro del navegador*/
    top: 50%;
    left: 50%;
    /*determinamos una anchura*/
    width: 400px;
    /*indicamos que el margen izquierdo, es la mitad de la anchura*/
    margin-left: -200px;
    /*determinamos una altura*/
    height: 300px;
    /*indicamos que el margen superior, es la mitad de la altura*/
    margin-top: -150px;
    border: 1px solid #808080;
    padding: 5px;
}

#side-menu {
    background-color: #2C2B7C;
    border: #EF4436 1px solid;

}

.fondo {
    background-image: url("../../img/v4.0/logo-friendlyPos-964x291.png");
    background-repeat: no-repeat;
    background-position: 0;
    background-position-x: 50%;
    min-height: 500px;
    opacity: 0.2;
}

.logo-login {
    margin-bottom: 10%;
}

.tablesHeaderBar {
    background: #2C2B7C;
    border-radius: 5px;
    color: white;
    font-weight: bold;
    height: 40px;
    padding: 10px;
    text-align: center;
}

@media only screen and (min-width: 320px) {
    .loginscreen.middle-box {
        margin-top: 5px;
        width: 300px;
    }

}

/* Small devices (landscape phones, 576px and up)*/
@media (min-width: 576px) {
    .loginscreen.middle-box {
        margin-top: 5px;
        width: 300px;
    }
}

/* Medium devices (tablets, 768px and up)*/
@media (min-width: 768px) {
    .loginscreen.middle-box {
        margin-top: 5px;
        width: 300px;
    }
}

/* Large devices (desktops, 992px and up)*/
@media (min-width: 992px) {
    .loginscreen.middle-box {
        margin-top: 20px;
        width: 300px;
    }
}

/* Extra large devices (large desktops, 1200px and up)*/
@media (min-width: 1200px) {
    .loginscreen.middle-box {
        margin-top: 5px;
        width: 300px;
    }

}

/* Extra large devices (large desktops, 1300px and up)*/
@media (min-width: 1500px) {
    .loginscreen.middle-box {
        margin-top: 100px;
        width: 300px;
    }
}