node_modules/@covalent/core/steps/nav/nav-steps-vertical/nav-steps-vertical.component.scss

.td-vertical-line-wrapper {
  position: relative;
  .td-vertical-line {
    position: absolute;
    top: -16px;
    height: 34px;
    border-left-width: 1px;
    border-left-style: solid;
    ::ng-deep :not([dir='rtl']) & {
      left: 20px;
      right: auto;
    }
    ::ng-deep [dir='rtl'] & {
      left: auto;
      right: 20px;
    }
  }
}