material.css

/*
Damit die Bilder, auch automatisch generierte  'responsive' sind.
*/
img {
    max-width: 100%;
    height: auto;
}

hr {
    margin: 100px 0;
}

.margin100top{
    margin-top: 100px;
}

table.markdown {
    margin: 0 auto;
    border: solid 1px #ddd;
    table-layout: auto;
    margin-bottom: 5em;
    width: 100%;
}

table.markdown thead tr th,
table.markdown tfoot tr th,
table.markdown tfoot tr td,
table.markdown tbody tr th,
table.markdown tbody tr td,
table.markdown tr td {
    display: table-cell;
}

table.markdown tbody tr:nth-child(odd) {
    background-color: #e5e5e5;
}

table.markdown tr th,
table.markdown tr td {
    color: #222;
    text-align: left;
    padding: .5em 5px;
    line-height: 1.5;
    border: 1px solid lightgray;
}

#lang_chooser {
    margin: 0 auto 100px;
}

.lang_con {
    cursor: pointer;
    font-size: 18pt !important;
    padding: 1px;
    margin: 5px;
    height: 200px;
    width: 200px;
    border-radius: 5px;
    border: 1px solid lightgray;
    box-shadow: 2px 2px 5px silver;
}

.lang_con:hover {
    background-color: #ffb400;
    border: 2px solid gray;
}

.active_lang {
    border: 2px solid gray;
    background-color: rgba(255, 180, 0, 0.33);
}

.lang_con > div {
    width: auto;
    height: 190px;
    margin: 5px auto;
}

.lang_con > div img {
    width: auto;
    height: 150px;
}

.language_section {
    padding-top: 75px;
}

@media (max-width: 767px) {

    .lang_con {
        width: 100px;
        height: 100px;
    }

    .lang_con > div {
        height: 90px;
        margin: 1px auto;
    }

    .lang_con > div img {
        height: 90px;
    }

    .lang_con a {
        display: none;
    }

}