JSFiddle - React, Tailwind, and code Playground

HTML

<script src="//code.jquery.com/jquery-3.3.1.slim.min.js"></script>
<link rel="stylesheet" href="https://stackpath.bootstrapcdn.com/bootstrap/3.4.0/css/bootstrap.min.css">
<script src="https://stackpath.bootstrapcdn.com/bootstrap/3.4.0/js/bootstrap.min.js"></script>
<link rel="stylesheet" href="https://use.fontawesome.com/releases/v5.6.3/css/all.css">
<div class="container">
  <br />
  <div class="row">

    <div class="col-md-12">

      <div class="panel panel-default">
        <div class="panel-leftheading">
          <h3 class="panel-lefttitle">
            <span class="titleWrapper">
            <i class="fa fa-user"></i>
          <span class="mainTitle">
            Main Title Here
          </span>
            <span class="subTitle">
            (Sub Title)
          </span>
            </span>
          </h3>
        </div>
        <div class="panel-rightbody">
          <p>Lorem ipsum dolor sit amet, consectetur adipisicing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut aliquip ex ea commodo consequat. Duis aute
            irure dolor in reprehenderit in voluptate velit esse cillum dolore eu fugiat nulla pariatur. Excepteur sint occaecat cupidatat non proident, sunt in culpa qui officia deserunt mollit anim id est laborum.</p>

          <p>Lorem ipsum dolor sit amet, consectetur adipisicing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut aliquip ex ea commodo consequat. Duis aute
          </p>

        </div>
        <div class="clearfix">
        </div>
      </div>
    </div>

CSS

.panel {
  position: relative;
}

.panel-default>.panel-leftheading {
  color: #333;
  background-color: #f5f5f5;
  border-color: #ddd;
}

.panel-primary>.panel-leftheading {
  color: #fff;
  background-color: #428bca;
  border-color: #428bca;
}

.panel-success>.panel-leftheading {
  color: #3c763d;
  background-color: #dff0d8;
  border-color: #d6e9c6;
}

.panel-info>.panel-leftheading {
  color: #31708f;
  background-color: #d9edf7;
  border-color: #bce8f1;
}

.panel-warning>.panel-leftheading {
  color: #8a6d3b;
  background-color: #fcf8e3;
  border-color: #faebcc;
}

.panel-danger>.panel-leftheading {
  color: #a94442;
  background-color: #f2dede;
  border-color: #ebccd1;
}

.panel-leftheading {
  width: 42px;
  padding-top: 10px;
  padding-right: 15px;
  padding-bottom: 10px;
  padding-left: 8px;
  border-right: 1px solid transparent;
  border-bottom: 1px solid transparent;
  border-top-right-radius: 3px;
  border-bottom-left-radius: 3px;
  border-bottom-right-radius: 3px;
  float: left;
  height: 100%;
}

.panel-lefttitle {
  margin-top: 110px;
  margin-bottom: 0;
  font-size: 12px;
  color: inherit;
  -webkit-transform: rotate(-90deg);
  -webkit-transform-origin: left top;
  -moz-transform: rotate(-90deg);
  -moz-transform-origin: left top;
  -ms-transform: rotate(-90deg);
  -ms-transform-origin: left top;
  -o-transform: rotate(-90deg);
  -o-transform-origin: left top;
  transform: rotate(-90deg);
  transform-origin: left top;
  white-space: nowrap;
}

.panel-rightbody {
  margin-left: 50px;
  height: 100%;
}






.mainTitle {
  display: block;
  font-style: bold;
  font-size: 14px;
}

.subTitle {
  font-style: italic;
}

.titleWrapper{
  text-align: center;
}