.stapel
{
    margin: 0%;
    width: 1000px;
    background-color: black;
}
.flex-container
{
    display: flex;
    width: 1000px;
    height: 500px;
    border: solid;
    border-width: 3px;
    flex-direction: row;
    align-items: flex-end;
}
#header_text
{
    width: 10vw;
}