How to stretch the sidebar?

Question

DLE

I can’t stretch the background sidebar like on the main one so that it stretches to the bottom along with the content as new comments are added.
Sidebar code

.sidebar {
    float: right;
    width: 246px;
    padding: 10px 0;
    min-height: 612px;
    display: table;
    table-layout: fixed;
    background: #444444;
}

If we apply height: 100px; then it won't stretch... and height: 100% doesn't work...

Answer 1

The solution was not in the CSS userinfo was in the wrong block...