node_modules/@covalent/core/steps/steps.component.scss

.td-line-wrapper,
.td-step {
  position: relative;
}

.td-steps-header {
  // layout
  box-sizing: border-box;
  display: flex;
  // layout="row"
  flex-direction: row;
}

.td-line-wrapper {
  width: 24px;
  min-height: 1px;
}

.td-horizontal-line {
  border-bottom-width: 1px;
  border-bottom-style: solid;
  height: 1px;
  position: relative;
  top: 36px;
  ::ng-deep :not([dir='rtl']) & {
    left: -6px;
    right: -3px;
  }
  ::ng-deep [dir='rtl'] & {
    left: -3px;
    right: -6px;
  }
  min-width: 15px;
  // flex
  flex: 1;
  box-sizing: border-box;
}

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