JSFiddle - React, Tailwind, and code Playground

HTML

<link rel="stylesheet" href="https://stackpath.bootstrapcdn.com/bootstrap/4.5.2/css/bootstrap.min.css">
<nav class="navbar navbar-expand-lg navbar-dark fixed-top" id="mainNav">
  <div class="container">
    <a class="navbar-brand js-scroll-trigger" href="#page-top">Bootstrap</a>
    <div>
      <ul class="navbar-nav text-uppercase ml-auto">
        <li class="nav-item">
          <a class="btn btn-primary my-2 my-sm-0" type="submit"><i class="fa fa-sign-out"></i> Log out</a>
        </li>
      </ul>
    </div>
  </div>
</nav>
<!--our content goes here-->
<div class="container content">
  <div class="row profile">
    <div class="col-md-3">
      <div class="profile-sidebar">
        <!-- SIDEBAR USERPIC -->
        <div class="profile-userpic">
          <img src="https://media.rockstargames.com/chinatownwars/global/downloads/avatars/zhou_256x256.jpg" class="img-responsive" alt="">
        </div>
        <!-- END SIDEBAR USERPIC -->
        <!-- SIDEBAR USER TITLE -->
        <div class="profile-usertitle">
          <div class="profile-usertitle-name">
            Jason Davis
          </div>
          <div class="profile-usertitle-job">
            Developer
          </div>
        </div>
        <!-- END SIDEBAR USER TITLE -->
        <!-- SIDEBAR BUTTONS -->
        <div class="profile-userbuttons">
          <button type="button" class="btn btn-success btn-sm">Follow</button>
          <button type="button" class="btn btn-danger btn-sm">Message</button>
        </div>
        <!-- END SIDEBAR BUTTONS -->
        <!-- SIDEBAR MENU -->
        <div class="profile-usermenu sidebar-sticky">
          <ul class="nav flex-column">
            <li class="active nav-item">
              <a href="#" class="nav-link active">
                <i class="fa fa-home"></i>
                Overview </a>
            </li>
            <li class="nav-item">
              <a class="nav-link" href="https://codepen.io/jasondavis/pen/jVRwaG?editors=1000">
                <i...

CSS

html,
body {
  height: 100%;
}

body {
  display: flex;
  flex-direction: column;
  background: #F1F3FA;
}

body {
  overflow-x: hidden;
}

#mainNav {
  background-color: darkslategrey;
  color: white;
}

#mainNav .navbar-brand {
  color: #fed136;
  font-family: 'Kaushan Script', 'Helvetica Neue', Helvetica, Arial, cursive;
}


.content {
  flex: 1 0 auto;
}

.footer {
  flex-shrink: 0;
}


footer {
  text-align: center;
  background-color: white;
}

.ft {
  padding-left: 22px;
  padding-right: 31px;
}

footer span.copyright {
  font-size: 90%;
  line-height: 40px;
  text-transform: none;
  font-family: 'Montserrat', 'Helvetica Neue', Helvetica, Arial, sans-serif;
  color: blak;
}

footer ul.quicklinks {
  font-size: 90%;
  line-height: 40px;
  margin-bottom: 0;
  text-transform: none;
  font-family: 'Montserrat', 'Helvetica Neue', Helvetica, Arial, sans-serif;
}

ul.social-buttons {
  margin-bottom: 0;
}

ul.social-buttons li a {
  font-size: 20px;
  line-height: 40px;
  display: block;
  width: 40px;
  height: 40px;
  -webkit-transition: all 0.3s;
  -moz-transition: all 0.3s;
  transition: all 0.3s;
  color: white;
  border-radius: 100%;
  outline: none;
  background-color: #212529;
}

ul.social-buttons li a:active,
ul.social-buttons li a:focus,
ul.social-buttons li a:hover {
  background-color: #fed136;
}

.content {
  margin-top: 60px;
}


/* Profile container */
.profile {
  margin: 20px 0;
}

/* Profile sidebar */
.profile-sidebar {
  padding: 20px 0 10px 0;
  background: #fff;
}

.profile-userpic img {
  float: none;
  display: block;
  margin: auto;
  width: 50%;
  height: 50%;
  -webkit-border-radius: 50% !important;
  -moz-border-radius: 50% !important;
  border-radius: 50% !important;
}

.profile-usertitle {
  text-align: center;
  margin-top: 20px;
}

.profile-usertitle-name {
  color: #5a7391;
  font-size: 16px;
  font-weight: 600;
  margin-bottom: 7px;
}

.profile-usertitle-job {
  text-transform: uppercase;
  color: #5b9bd1;
  font-size: 12px;
 ...