<ul>
  <li>1</li>
  <li>2</li>
  <li>3</li>
  <li>4</li>
</ul>
ul {
  padding: 0;
  display: inline-flex;
  align-items: center;
  justify-content: flex-start;
  
  gap: 30px;
   position: relative;
 
}
ul:before {
  content:'';
  position: absolute;
  top: 50%;
  left: 0;
  right: 0;
  margin-top: -1px;
  height: 2px;
    background-color: turquoise;
}
li {
  list-style: none;
  background-color: turquoise;
  position: relative;
  color: #fff;
  font-weight: 700;
  font-family: arial;
  display: flex;
  align-items: center;
  justify-content: center;
  height: 40px;
  width: 40px;
  flex: 0 0 40px;
  border-radius: 50%;
  transition: .2s;
  cursor: pointer;
}
li:hover {
  box-shadow: 0 0 15px 4px turquoise;
}

External CSS

This Pen doesn't use any external CSS resources.

External JavaScript

This Pen doesn't use any external JavaScript resources.