Most settings are in the modules for easy editing.

Edit this section of CSS to adjust the icon overlap:

/*Overlap the icon*/

.ds-advent-12 .et_pb_blurb_content {
    margin-top: -75px;
}

Edit this section of CSS to adjust module spacing on smaller screens:

/*Adjust margin on tablets*/

@media all and (min-width: 480px) and (max-width: 980px) {
    .ds-advent-12.et_pb_row_4col .et_pb_column:nth-last-child(-n+2) {
        margin-top: 75px;
    }
}


/*Adjust margin on mobiles*/

@media all and (max-width: 479px) {
    .ds-advent-12 .et_pb_column {
        margin-bottom: 100px !important;
    }
    .ds-advent-12 .et_pb_column:last-of-type {
        margin-bottom: 0px !important;
    }
}