May be you can try something like this. I have attached screenshot as well.

#ScreenFlowTabs {
  margin-left: 21px;
}

/* tabbed screenflow styles */

#ScreenFlowTabs ul {
  margin: 30px 0;
  padding: 0;
  counter-reset:steps;
}

/* when shapes in flow are marked to hide at runtime, hide the step */

#ScreenFlowTabs ul li.hidden {
  display: none;
}
  
#ScreenFlowTabs ul #current {
  color:#2da0ba;
}

 #ScreenFlowTabs ul #success {
  color:#838e88;
}

#ScreenFlowTabs ul li:last-child {
  border: none;
  margin-top: 3px; /* same DOM height value as the border width */
}

#ScreenFlowTabs ul li.ie8-last-child {
  border: none;
  margin-top: 3px; /* same DOM height value as the border width */
}

#ScreenFlowTabs li a {
  color: white;
  text-decoration: none;
  padding: 10px 0 10px 65px;
  background: grey; /* fallback color */
  position: relative;
  display: block;
  float: left;
}

#ScreenFlowTabs ul li#current a {
  color: white;
  text-decoration: none;
  padding: 10px 0 10px 65px;
  background: #23609d; /* fallback color */
  position: relative;
  display: block;
  float: left;
}

#ScreenFlowTabs ul li a::after {
  content: " ";
  display: block;
  width: 0;
  height: 0;
  border-top: 18px solid transparent; /* Go big on the size, and let overflow hide */
  border-bottom: 18px solid transparent;
  border-left: 27px solid grey;
  position: absolute;
  top: 36%;
  margin-top: -13px;
  left: 100%;
  z-index: 2;
}

#ScreenFlowTabs ul li#current a::after {
  content: " ";
  display: block;
  width: 0;
  height: 0;
  border-top: 18px solid transparent; /* Go big on the size, and let overflow hide */
  border-bottom: 18px solid transparent;
  border-left: 27px solid #23609d;
  position: absolute;
  top: 36%;
  margin-top: -13px;
  left: 100%;
  z-index: 2;
}

#ScreenFlowTabs li a::before {
  content: " ";
  display: block;
  width: 0;
  height: 0;
  border-top: 20px solid transparent;
  border-bottom: 20px solid transparent;
  border-left: 30px solid white;
  position: absolute;
  top: 37%;
  margin-top: -15px;
  margin-left: 1px;
  left: 100%;
  z-index: 2;
}