Hi Anni,
I assume you’re still referring to the 3 buttons on those 3 columns, there are multiple URLs from that thread which a bit confusing which should be aligned.
Please replace that CSS with this
.x-column.button-force-bottom {
padding-bottom: calc( 2em + 84px );
}
.x-column.button-force-bottom .x-btn{
position: absolute;
bottom: 2em;
width: calc( 100% - 3.6em );
}
.x-column.button-force-bottom .x-text {
min-height: 60px;
}
.x-column.button-force-bottom .x-text + .x-text {
min-height: 138px;
}
Then add button-force-bottom to each of the column’s Class input field. It’s no longer about my-button since it has to be applied to the column itself, it’s where the buttons need to align.
And this is only applicable for that current setup, don’t use it on other columns and buttons. Else, you can duplicate that CSS with different Class name and style values. You’re free to enhance it but we can’t further cover any customization for other elements. Above CSS should serve as a sample 
Thanks!