Hey Victoria, thanks for your support. I found this code in another post here in the forum and put it into the customizer with additional CSS:

/* buttons fixed to the bottom */
.mp_row_align_buttons .avia-button-wrap {
display: inline-block;
position: absolute;
bottom: 0;
left: 0;
right: 0;
}
.mp_row_align_buttons .flex_column.av_one_third {
padding-bottom: 70px !important;
}

The buttons are now aligned, but I can’t control them by changing the values in the code. I want a space to the bottom of the column and the text above it. For example 30 px.
I tried 30 px White Space Separator under the buttons in the first line. This has no effect. Is perhaps the wrong way?

Thank you very much for helping me ;-)