JSFiddle - React, Tailwind, and code Playground

HTML

<link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.6/css/bootstrap.min.css">
<div class="progress">
  <div class="progress-bar progress-bar-striped active" role="progressbar" aria-valuenow="100" aria-valuemin="0" aria-valuemax="100" style="width: 100%">
    <span>Please wait<span class="dotdotdot"></span></span>
  </div>
</div>

CSS

.progress {
    margin: 15px;
}

.progress .progress-bar.active {
    font-weight: 700;
    animation: progress-bar-stripes .5s linear infinite;
}

.dotdotdot:after {
    font-weight: 300;
    content: '...';
    display: inline-block;
    width: 20px;
    text-align: left;
    animation: dotdotdot 1.5s linear infinite;
}

@keyframes dotdotdot {
  0%   { content: '...'; }
  25% { content: ''; }
  50% { content: '.'; }
  75% { content: '..'; }
}