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w3schools: How TO - Subnav

https://www.w3schools.com/howto/howto_css_subnav.asp

 /* The navigation menu */
.navbar {
  overflow: hidden;
  background-color: #333;
}

/* Navigation links */
.navbar a {
  float: left;
  font-size: 16px;
  color: white;
  text-align: center;
  padding: 14px 16px;
  text-decoration: none;
}

/* The subnavigation menu */
.subnav {
  float: left;
  overflow: hidden;
}

/* Subnav button */
.subnav .subnavbtn {
  font-size: 16px;
  border: none;
  outline: none;
  color: white;
  padding: 14px 16px;
  background-color: inherit;
  font-family: inherit;
  margin: 0;
}

/* Add a red background color to navigation links on hover */
.navbar a:hover, .subnav:hover .subnavbtn {
  background-color: red;
}

/* Style the subnav content - positioned absolute */
.subnav-content {
  display: none;
  position: absolute;
  left: 0;
  background-color: red;
  width: 100%;
  z-index: 1;
}

/* Style the subnav links */
.subnav-content a {
  float: left;
  color: white;
  text-decoration: none;
}

/* Add a grey background color on hover */
.subnav-content a:hover {
  background-color: #eee;
  color: black;
}

/* When you move the mouse over the subnav container, open the subnav content */
.subnav:hover .subnav-content {
  display: block;
} 

<!-- The navigation menu -->
<div class="navbar">
  <a href="#home">Home</a>
  <div class="subnav">
    <button class="subnavbtn">About <i class="fa fa-caret-down"></i></button>
    <div class="subnav-content">
      <a href="#company">Company</a>
      <a href="#team">Team</a>
      <a href="#careers">Careers</a>
    </div>
  </div>
  <div class="subnav">
    <button class="subnavbtn">Services <i class="fa fa-caret-down"></i></button>
    <div class="subnav-content">
      <a href="#bring">Bring</a>
      <a href="#deliver">Deliver</a>
      <a href="#package">Package</a>
      <a href="#express">Express</a>
    </div>
  </div>
  <div class="subnav">
    <button class="subnavbtn">Partners <i class="fa fa-caret-down"></i></button>
    <div class="subnav-content">
      <a href="#link1">Link 1</a>
      <a href="#link2">Link 2</a>
      <a href="#link3">Link 3</a>
      <a href="#link4">Link 4</a>
    </div>
  </div>
  <a href="#contact">Contact</a>
</div>