.left-part {
    position: fixed;
    width: 30%;
    float: left;
    height: 50vh;
    align-content: center;
    /* vertical-align: middle; */
    /* padding-top: 60px; */
}

.presentation{
    height: 50vh;
    align-content: center;
}

.author__urls{
    padding-top: 10px   ;
}

.author__urls li {
    white-space: nowrap;
    margin-bottom: 5px;
    padding-right: 5px;
    padding-left: 5px;
    padding-top: 2px;
    padding-bottom: 2px;

}

.author__urls ul {
    list-style-type: none;
    margin: 0;
    padding: 0;
}

.author__urls a {
    display: block;
    color: inherit;
    font-size: 1em;
    text-decoration: none;
}


.author__urls a:hover, a:active {
    color: rgb(108, 108, 108)
}

@media (max-height: 400px) {
    .left-part {
        padding-top: 20px;
    }
}

.right-part {
    width: 70%;
    float: right;
}

@media (max-width: 768px) {
    .left-part {
        position: inherit;
        width: 100%;
        float: left;
        vertical-align: middle;
        font-size: smaller;
        height: initial;
        margin-bottom: 30px;
    }

    .right-part {
        width: 100%;
        float: left;
    }
}