<http://sundari-webdesign.com/divi-equal-module-height-instead-of-equal-column-height/>

Not tested yet

/* -- START make modules in a row the same height -- */
.et_pb_equal_columns .et_pb_column {
display: -webkit-box;
display: -moz-box;
display: -ms-flexbox;
display: -webkit-flex;
display: flex;
}
.et_pb_module {
max-width: 100%
}
.et_pb_text_align_center {
margin: 0 auto;
}
/* -- END make modules in a row the same height -- */
Code language: CSS (css)