div#specimen-download {
    position: relative; /* von absolute auf relative ändern */
    width: 200px;
    height: 140px;
    background: white;
    border: 1px solid var(--black);
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    text-align: center; 
    transition: 0.2s; }

        .bindung-horizontal, .bindung-horizontal-hide {
        position: absolute;
        left: -6px;
        width: 12px;
        height: 1px;
        background: black;
        transition: 0.2s; }

        div#specimen-download:hover {
        border-radius: 0px 20px 20px 0px;
        transition: 0.2s;  } 

div#trials {
    position: relative;
    width: 200px;
    height: 140px;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    text-align: center; 
    transition: 0.2s;
    background: var(--white);
    border: 1px solid var(--black);
    cursor: pointer;
    transition: 0.2s;
    width: 200px;
    height: 140px;
    border-radius: 5px; }

    div#trials:hover {
    border-radius: 50px; }


    div#specimen-download, div#trials
    { margin-bottom: 10px; }


@media (max-width: 768px) {




    div#specimen-download, div#trials
    { margin-bottom: 00px; }

    div#specimen-download  {
    width: 135px;
    height: 92px; }

        .bindung-horizontal-hide  {
        display:none; }


    div#trials {
    width: 135px;
    height: 93px;}

}