JSFiddle - React, Tailwind, and code Playground

HTML

<body body ng-app="app" ng-controller="Ctrl">
  <header>
    <img src="images/head2.jpg" width="100%" height="50%" />
  </header>
  <ul class="lang">
    <li class="lang"><a type="button" class="btn btn-info active" ng-click="changeLanguage('en')" translate="BUTTON_LANG_EN">английский</a></li>
    <li class="lang"><a type="button" class="btn btn-info active" ng-click="changeLanguage('ru')" translate="BUTTON_LANG_RU">русский</a></li>
  </ul>

  <div class="welcome">

    <h1 translate="WELCOME"></h1>
    <div class="container">
      <div class="cover">
        <img id="cover" src="images/rus/1.png" width="190" height="380">
      </div>

      <div class="text">
        <p translate="TEXT_1"></p>
      </div>
    </div>
  </div>

  <div class="content">

    <div class="text_content">
      <p translate="TEXT_2"></p>
    </div>
    <div class="banner">
      <img src="images/pic1.jpg" width="250" height="160" />
    </div>

    <div class="guide">
      <h3 class="type_nume" translate="TYPE_NUMBER"></h3>

      <ol class="type_nume" color="#FF4500">
        <li class="type_nume"><span class="colortext">b</span> – <span translate="TYPE_BIN">binary;</span></li>
        <li class="type_nume"><span class="colortext">o</span> – <span translate="TYPE_OCT">octal;</span></li>
        <li class="type_nume"><span class="colortext">d</span> – <span translate="TYPE_DEC">decimal;</span></li>
        <li class="type_nume"><span class="colortext">h</span> – <span translate="TYPE_HEX">hexadecimal;</span></li>
      </ol>
      <p align="justify" translate="TEXT_3"></p>

      <p align="justify" translate="TEXT_4"></p>
    </div>
    <!-- YOUTUBE -->

    <!-- ru link -->
    <!--	<iframe style="display: table; margin: 50px auto;" width="560" height="315" src="https://www.youtube.com/embed/pmDE8SLjhqo?rel=0" frameborder="0" allowfullscreen></iframe>		-->
    <!-- en link -->
    <iframe style="display: table; margin: 50px auto;" width="560" height="315"...

CSS

span.colortext {
  color: #FF4500;
  /* Красный цвет выделения */
}

h1,
h2,
h3,
h4,
p {
  font-family: Roboto;
}

.radius {
  background: #f0f0f0;
  border: 1px solid black;
  padding: 20px;
  margin-bottom: 100px;
}

li.lang {
  display: inline;
}

ul.lang {
  list-style-type: none;
  margin: 0;
  padding: 10px;
  text-align: right;
  line-height: 15px;
  word-spacing: 20px;
}

.welcome {
  width: 100%;
  height: 500px;
  margin-top: 30px;
  margin-bottom: 30px;
}

.welcome h1 {
  text-align: center;
  font-size: 30pt;
}

.container {
  display: table;
  margin: 50px auto 0 auto;
  height: 380px;
}

.cover {
  width: 100px;
  height: 380px;
  margin: 0px 25px 0px 0px;
  float: left;
}

.text {
  display: table;
  margin: 50px auto 0 auto;
  width: 500px;
  height: 200px;
}

.text p {
  font-size: 20pt;
}

.content {
  display: table;
  margin: 0 auto;
  width: 800px;
}

.banner {
  margin-top: 20px;
}

.text_content {
  font-size: 20pt;
  float: left;
  margin-right: 25px;
  width: 525px;
  text-align: right;
  padding-bottom: 50px;
}

.content h2 {
  font-size: 20pt;
}

.content p {
  font-size: 20pt;
}

.type_nume {
  font-size: 20pt;
}

.guide h3 {
  /* надпись съехала */
}

.guide ol {
  display: table;
}

.guide {
  margin-top: 100px;
}

.guide p {
  margin-top: 25px;
}

.download h2 {
  font-size: 26pt;
}

.download {
  text-align: center;
}

.footer {
  background: #37b201;
  height: 100px;
}

.footer p {
  color: #FFF;
  padding-top: 10px;
  margin-left: 100px;
  font-size: 16pt;
}