I was able to target the column with existing classes. I tried adding a class to the fields but was not successful in getting it to work that way. I applied the following CSS and have it working pretty well.
/* Custom Column Layout Sizing */
li.gfmc-column.gfmc-row-2-column.gfmc-row-2-col-1-of-3 {
width: 50% !important;
}
li.gfmc-column.gfmc-row-2-column.gfmc-row-2-col-2-of-3 {
width: 25% !important;
}
li.gfmc-column.gfmc-row-2-column.gfmc-row-2-col-3-of-3 {
width: 25% !important;
}
li.gfmc-column.gfmc-row-3-column.gfmc-row-3-col-1-of-3 {
width: 50% !important;
}
li.gfmc-column.gfmc-row-3-column.gfmc-row-3-col-2-of-3 {
width: 25% !important;
}
li.gfmc-column.gfmc-row-3-column.gfmc-row-3-col-3-of-3 {
width: 25% !important;
}
li.gfmc-column.gfmc-row-4-column.gfmc-row-4-col-1-of-3 {
width: 50% !important;
}
li.gfmc-column.gfmc-row-4-column.gfmc-row-4-col-2-of-3 {
width: 25% !important;
}
li.gfmc-column.gfmc-row-4-column.gfmc-row-4-col-3-of-3 {
width: 25% !important;
}