header {
    width: 100%;
    display: flex;
    align-items: center;
    height: 150px;
}

header h3 {
    margin: 0 auto;
    display: block;
    text-align: center;
}

.visualcontainer {
    position: relative;
    /*padding: 100px 0 0 0;*/
    margin: 0;
    float: left;
    width: 100%;
    height: 100%;
    min-height: 400px;
    /*border: 3px solid rgba(0,255,0,0.5); /* Grün */
}

.slides {
    position: relative;
    width: 100%;
    height: 100%;
    display: flex;
    justify-content: flex-start; /* align items in Main Axis */
    /*align-items: stretch; /* align items in Cross Axis */
    /*align-content: stretch; /* Extra space in Cross Axis */
    padding-top: 150px; /* height vom header */
}

a.content { /* Inhalte im .visualcontainer > .slides */
    position: relative;
    margin: 0;
    flex: 1; /* entspricht 50% Breite */
}

a.content:first-child { /* Inhalte im .visualcontainer */
    background: url('../assets/puzzle-kreis.jpg') no-repeat center center / 80%;
}

a.content:last-child {
    background: url('../assets/yin-yang.gif') no-repeat center center / 80%;
}

/* Farblayer über Image */
a.content > div {
    width: 100%;
    height: 100%;
   -webkit-transition: all 250ms;
   -moz-transition:    all 250ms;
   -o-transition:      all 250ms;
   -ms-transition:     all 250ms;
    transition:        all 250ms;
    text-decoration: none;
}

/* Hellblauer Farblayer über Puzzle */
a.content:first-child > div {
    background-color: rgba(208,228,240,0.94);
}

/* Beigefarbener Farblayer über Yin-Yang */
a.content:last-child > div {
    border-left: 1px solid rgba(0,0,0,0.1); /* Schwarze Trennlinie */
    /*background-color: rgba(235,223,204,0.98);*/
    /*background-color: rgba(235,227,216,0.98);*/
    background-color: rgba(235,226,211,0.98);
}

a.content:hover:first-child > div {
    background-color: rgba(255,255,255,.9);
}

a.content:hover:last-child > div {
    background-color: rgba(255,255,255,.97);
}


/* Logos innerhalb der sections */
a.content > div img {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    width: 100%;
    max-width: 31.250em; /* 500px */
    padding: 0 3em;
}



/* --------------------------------------------------------------------------------------- */


    /*@media screen and (max-width: 40em) { /* 640 */
    @media screen and (max-width: 46.250em) { /* 740 */

        header h3 {
            font-size: 1.1em;
        }

        .slides {
            flex-direction: column; /* row | row-reverse | column | column-reverse */
        }

        a.content:last-child > div { /* Inhalte im .visualcontainer */
            border-left: none;
            border-top: 1px solid rgba(0,0,0,0.1); /* Schwarze Trennlinie */
        }

    }

/* --------------------------------------------------------------------------------------- */