[Resolved] Read More buttons in line

You could do this:

.generate-columns .inside-article {
    display: flex;
    flex-flow: column;
}

.entry-summary {
    display: flex;
    flex-flow: column;
    flex: 1;
}

.read-more-container {
    margin-top: auto;
}

Depending on which browsers you need to support, you may want to pop that CSS into the prefixer here: https://autoprefixer.github.io/

No problem! 🙂