Note:
Columns must be set to equal height

CSS

/* Callout buttons */
.fl-col-group-equal-height .fl-col-content {position:relative;}
.fl-col-group-equal-height .fl-callout {padding-bottom:50px;}
.fl-col-group-equal-height .fl-callout-button {position:absolute; bottom:20px; width: calc(100% - 40px);}

/* Infobox buttons */
.fl-col-group-equal-height .fl-col-content {position:relative;}
.fl-col-group-equal-height .uabb-infobox {padding-bottom:50px;}
.fl-col-group-equal-height .uabb-infobox-button {position:absolute; bottom:20px; width: calc(100% - 40px);}

/* Pricing Table */
.equal-height .fl-pricing-table {display:flex; flex-wrap:wrap;}
.equal-height .fl-pricing-table > div > div { height:100%; }
.equal-height .fl-pricing-table .fl-pricing-table-inner-wrap { height: calc(100% - 24px); display: flex; flex-direction: column; }
.equal-height .fl-pricing-table .fl-button-wrap {margin-top:auto; margin-bottom:20px;}