img {
    width: 100%;
}

.col-md-6 {
    text-align: center;
}

.col-xl-4 {
    text-align: center;
}

#logo {
    max-width: 50vw;
}

#portrait {
    max-width: 60vw;
}

#wartebereich {
    height: 30vh;
    max-height: 30vh;
    width: auto !important;
    margin: auto;
}

@media only screen and (min-width: 576px) { /*bis 767px*/
    #logo {
        max-width: 50vw;
    }

    #portrait {
        max-width: 40vw;
    }

    #wartebereich {
        height: 45vh;
        max-height: 45vh;
    }
}

@media only screen and (min-width: 768px) { /*bis 1199px*/
    #portrait {
        max-width: 30vw;
    }

    #wartebereich {
        height: 50vh;
        max-height: 50vh;
    }
}

@media only screen and (min-width: 1200px) {
    #wartebereich {
        height: 80vh;
        max-height: 80vh;
    }
}