Firstly, you remove this custom css rule on your site now:
.item.col-12.col-md-12.col-lg-12.column- {
margin-top: 10px;
border-bottom: solid 0.5px #e6e6e6;
}
and add this rule:
.blog-items .items-row .item {
margin-top: 10px;
position: relative; /* Add relative positioning */
}
.blog-items .items-row .item::after {
content: "";
position: absolute;
bottom: 0;
left: 15%;
width: 70%;
border-bottom: solid 0.5px #e6e6e6;
}
If you're not familiar with coding, you should hire a developer to get it done for you as customization is available for paid members only.