.cross-references {
    margin: -.5rem;
}

.cross-references .cross-reference {
    background-size: cover;
    border-radius: .1rem;
    float: left;
    height: 290px; /* damit wird sichergestellt, dass der Float ohne clear funktioniert */
    margin: .5rem;
    overflow: hidden;
    position: relative;
    width: calc(33.333% - 1rem);
}

.cross-references .cross-reference[data-has-pop-up-text="1"] > div,
.cross-references .cross-reference[data-has-pop-up-text="1"] > h3,
.cross-references .cross-reference[data-has-pop-up-text="1"] > h3 span {
    cursor: pointer;
}

.cross-references .cross-reference > div {
    background-color: rgba(0, 0, 0, .3);
    bottom: 0;
    left: 0;
    opacity: 1;
    position: absolute;
    right: 0;
    top: 0;
    transition: opacity .3s ease-in-out;
}

.cross-references .cross-reference:hover > div {
    opacity: 0;
}

.cross-references .cross-reference > h3 {
    color: #fff;
    hyphens: auto;
    left: 1rem;
    position: absolute;
    text-align: center;
    text-shadow: 0 0 .1rem #000;
    top: 50%;
    transform: translateY(-50%);
    width: calc(100% - 2rem);
    -webkit-hyphens: auto;
}

.cross-references .cross-reference > h3 span {
    color: #fff;
    display: block;
    hyphens: auto;
    margin-left: 1rem;
    -webkit-hyphens: auto;
    width: calc(100% - 2rem);
}

.cross-references .cross-reference .pop-up-text {
    display: none !important;
}

.cross-references > .pop-up-text {
    background-color: #e8f0f4;
    border-radius: .1rem;
    box-sizing: border-box;
    display: none;
    float: left;
    margin: .5rem;
    padding: 1rem 1rem 0;
    position: relative;
    width: calc(100% - 1rem);
}

.cross-references > .pop-up-text > span {
    background-image: url('../Icons/Close.svg');
    background-position: center;
    background-repeat: no-repeat;
    background-size: 1.25rem 1.25rem;
    cursor: pointer;
    height: 1.25rem;
    position: absolute;
    right: 1rem;
    top: 1rem;
    width: 1.25rem;
}

.cross-references > .pop-up-text h3 {
    margin-top: .5rem;
}

.cross-references > .pop-up-text img {
    border-radius: .1rem;
    display: block;
    float: left;
    margin: 0 1rem 1rem 0;
    width: calc(50% - .5rem);
}

.cross-references > .pop-up-text h3 + div {
    margin-bottom: 1rem;
}

@media (max-width: 1199px) {
    .cross-references .cross-reference {
        height: 210px;
    }
}

@media (max-width: 991px) {
    .cross-references .cross-reference {
        height: 260px; /* damit wird sichergestellt, dass der Float ohne clear funktioniert */
        width: calc(50% - 1rem);
    }
}

@media (max-width: 767px) {
    .cross-references {
        margin: -2rem 0 0;
    }

    .cross-references .cross-reference {
        height: 320px; /* damit wird sichergestellt, dass der Float ohne clear funktioniert */
        margin: 2rem 0 0;
        width: 100%;
    }

    .cross-references > .pop-up-text {
        margin: 0;
        padding: 2rem 2rem 0;
        width: 100%;
    }

    .cross-references > .pop-up-text > span {
        background-size: 1.5rem 1.5rem;
        height: 1.5rem;
        right: 2rem;
        top: 2rem;
        width: 1.5rem;
    }

    .cross-references > .pop-up-text h3 {
        margin-top: 0;
    }

    .cross-references > .pop-up-text img {
        display: none;
    }

    .cross-references > .pop-up-text .btn {
        margin-bottom: 2rem;
    }
}