Bootstrap

The Bootstrap Project

Installing Bootstrap in GitHub Pages

Components

https://getbootstrap.com/docs/4.4/components/navbar/

<nav class="navbar navbar-expand-lg navbar-light bg-light">
  <a class="navbar-brand" href="#">Navbar</a>
  <button class="navbar-toggler" type="button" data-toggle="collapse" data-target="#navbarNavAltMarkup" aria-controls="navbarNavAltMarkup" aria-expanded="false" aria-label="Toggle navigation">
    <span class="navbar-toggler-icon"></span>
  </button>
  <div class="collapse navbar-collapse" id="navbarNavAltMarkup">
    <div class="navbar-nav">
      <a class="nav-item nav-link active" href="#">Home <span class="sr-only">(current)</span></a>
      <a class="nav-item nav-link" href="#">Features</a>
      <a class="nav-item nav-link" href="#">Pricing</a>
      <a class="nav-item nav-link disabled" href="#" tabindex="-1" aria-disabled="true">Disabled</a>
    </div>
  </div>
</nav>

<style>
.navbar-light .navbar-nav .nav-link {
    color: rgba(0,0,0,.5);
}
@media (min-width: 992px)
.navbar-expand-lg .navbar-nav .nav-link {
    padding-right: .5rem;
    padding-left: .5rem;
}
.navbar-nav .nav-link {
    padding-right: 0;
    padding-left: 0;
}
.nav-link {
    display: block;
    padding: .5rem 1rem;
}
a {
    color: #007bff;
    text-decoration: none;
    background-color: transparent;
}
*, ::after, ::before {
    box-sizing: border-box;
}
user agent stylesheet
a:-webkit-any-link {
    color: -webkit-link;
    cursor: pointer;
    text-decoration: underline;
}
.navbar-nav {
    display: -ms-flexbox;
    display: flex;
    -ms-flex-direction: column;
    flex-direction: column;
    padding-left: 0;
    margin-bottom: 0;
    list-style: none;
}
body {
    margin: 0;
    font-family: -apple-system,BlinkMacSystemFont,"Segoe UI",Roboto,"Helvetica Neue",Arial,"Noto Sans",sans-serif,"Apple Color Emoji","Segoe UI Emoji","Segoe UI Symbol","Noto Color Emoji";
    font-size: 1rem;
    font-weight: 400;
    line-height: 1.5;
    color: #212529;
    text-align: left;
    background-color: #fff;
}
</style>

Frameworks

https://getbootstrap.com/docs/4.4/examples/