.presentation__header {
    /*box*/
    position:sticky;
    top:0;
    display: flex;
    flex-direction: row;
    align-items: center;
    justify-content: space-between;
    width:100%;
    padding:10px 0px;
    z-index: 3;

    /*background*/
    background-color: var(--c-quaternary-4);
}