Hi,
it was in template.css file.
.indigo-features-list div[class*="sppb-col"] div[id*="sppb-addon"]{height:100%;border-right:1px solid #ebebeb;border-bottom:1px solid #ebebeb}
.indigo-features-list div[class*="sppb-col"]:nth-child(4) div[id*="sppb-addon"]{border-right:none}
.indigo-features-list div[class*="sppb-col"]:nth-child(1n+5) div[id*="sppb-addon"]{border-bottom:none}
.indigo-features-list .sppb-row>div:last-child div[id*="sppb-addon"]{border-right:none}
basic CSS effects as you can see, with 100% height for column(s), and border definition.
About 2nd question, I don't know the answer, probably was forgotten.