How do I add a border under each navigation link without making the bottom border more bold

Question

I can't seem to make the bottom border under LinkedIn link less bold as it is double bordered.

ul {
  list-style-type: none;
  margin: 0px;
  padding: 0px;
  width: 100px;
  border: 1px solid;
  border-bottom: 1px solid;
}

li a {
  display: block;
  color: #000000;
  padding: 8px 16px;
  text-decoration: none;
  text-align: center;
  border: 1px;
  border-bottom: 1px solid;
}

li:last-child {
  border-bottom: none;
}

li a:hover {
  background-color: red;
  color: white;
}

<ul>
  <li><a href="index.html">Home</a></li>
  <li><a href="about.html">About</a></li>
  <li><a href="services.html">Services</a></li>
  <li><a href="contact.html">Contact</a></li>
  <li><a href="https://www.linkedin.com/in/derrickogole">LinkedIn</a></li>
</ul>

Answer 1

change css

li:last-child a {
  border-bottom: none; 
}