To add a vertical line to Summary Item, you can use this code to Website Tools > Custom CSS
@media screen and (min-width:992px) {
div.summary-item:not(:last-child):after {
content: "";
height: 100%;
width: 2px;
background-color: black;
display: block;
position: absolute;
top: 0;
right: -6.8965%;
z-index: 99999999;
}
div.summary-item {
overflow: visible !important;
}}