CSS pointed div

.mat-step-header {
  flex-basis: 0;
  flex-grow: 1;
  justify-content: center;
  overflow: visible;
 
  &:first-of-type::after {
    content: "";
    position: absolute;
    right: -20px;
    bottom: 0;
    width: 0;
    height: 0;
    border-left: 20px solid var(--bg-color-00-07);
    border-top: 35px solid transparent;
    border-bottom: 35px solid transparent;
  }
 
}