tree-table.min.css

tr .tt-details-control{vertical-align:middle!important}tr .tt-details-control .expander{position:relative;color:transparent;margin:0 10px}tr.has-child .tt-details-control{cursor:pointer}tr.has-child .tt-details-control .expander{cursor:pointer}tr.has-child .tt-details-control .expander::after{content:'';position:absolute;-webkit-transform:translate(-18%,-50%) rotate(-90deg);transform:translate(-18%,-50%) rotate(-90deg);border-left:5.04px solid transparent;border-right:5.04px solid transparent;border-top:7px solid #000;transition:all .3s cubic-bezier(.175,.885,.32,1.275);cursor:pointer}tr.open .tt-details-control .expander::after{-webkit-transform:translate(-18%,-50%) rotate(0);transform:translate(-18%,-50%) rotate(0)}tr:not(.has-child) .tt-details-control .expander::after{content:'-';font-weight:700;color:#000;border:0}tr.level-1 .tt-details-control .expander::after{margin-left:10px}tr.level-2 .tt-details-control .expander::after{margin-left:20px}tr.level-3 .tt-details-control .expander::after{margin-left:30px}tr.level-4 .tt-details-control .expander::after{margin-left:40px}tr.level-5 .tt-details-control .expander::after{margin-left:50px}