How to align content of a div to the bottom

Answer 1

#header {
    height: 150px;
    display:flex;
    flex-direction:column;
}

.top{
    flex: 1;
}   


    
Header title
    Header content (one or multiple lines)

#header {
    height: 250px;
    display:flex;
    flex-direction:column;
    background-color:yellow;
}

.top{
    flex: 1;
}

    
Header title
    Header content (one or multiple lines)