jQuery addClass example

Change class name on click in jQuery

HTML

<header>
    <div class="container">
        <div class="header_menu clearfix">
            <div class="logo">MoGo</div>
             <nav>
                <ul>
                    <li>
                        <a class="active" href="#">about</a>
                    </li>
                    <li>
                        <a href="#">service</a>
                    </li>
                    <li>
                        <a href="#">work</a>
                    </li>
                    <li>
                        <a href="#">blog</a>
                    </li>
                    <li>
                        <a href="#">contact</a>
                    </li>
                    <li>
                      <a href="#">
                        <i class="fa fa-shopping-cart"></i>
                      </a>
                    </li>
                    <li>
                      <a href="#">
                        <i class="fa fa-search"></i>
                      </a>
                    </li>
                </ul>
            </nav>
        </div>
    </div>
</header>

CSS

* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}
.container {
  width: 100%;
  height: 100vh;
  background: pink;
  padding: 40px 0;
}
.header_menu {
  display: flex;
  justify-content: space-around;
  align-items: center;
}
nav ul {
  display: flex;
}
ul li {
  list-style: none;
}
ul a {
  display: block;
  padding: 20px 2px;
  color: black;
  text-decoration: none;
  text-transform: uppercase;
}
ul a {
  margin-right: 20px;
}

li a.active {
  border-bottom: 3px solid red;
  padding-bottom: 5px;
}