/* für image-slider */
button.icon {
    background: white;
    border: solid;
    cursor: pointer;
    width: 50px;
    height: 50px;
    position: absolute;
    top: 0.5rem;
    right: 0.5rem;
    outline: 0;
    filter: grayscale();
}

summary,
details {
    margin-bottom: 1em;
}

summary {
    font-weight: bold;
    cursor: pointer;

    &::marker {
        content: "";
    }

    &::before {
        content: "+";
        width: 2rem;
        height: 2rem;
        display: inline-block;
        background: #333;
        border-radius: 1rem;
        text-align: center;
        line-height: 2rem;
        color: #fff;
        font-weight: 100;
        margin-right: 1rem;
    }
}

details {
    border-bottom: 1px solid #ccc;

    &[open] summary::before {
        content: "–";
    }
}