JSFiddle - React, Tailwind, and code Playground

HTML

<script src="src=&quot;https://use.fontawesome.com/c528a98f8d.js&quot;"></script>
<header class="page-header">
<div class="container">
  <div class="page-header__left">
    <div class="page-header__user">
      <div class="page-header__user-avatar"><img src="http://lorempixel.com/30/30" /></div>
      <div class="page-header__user-text"> Bred Pit</div>
    </div>
  </div>
  <div class="page-header__right">
    <div class="page-header__contacts"><a href="#" class="page-header__contacts-link"><span class="page-header__contacts-link">Мои контакты</span></a>
      <div class="page-header__dropdown-menu">
        <ul class="page-header__contacts-ul-menu">
          <div class="contacts-menu__li"><a href="#" class="contacts-menu__link"><i aria-hidden="true" class="fa fa-envelope"></i><span class="contacts-menu__text">bred@mail.ru</span></a></div>
          <div class="contacts-menu__li"><a href="#" class="contacts-menu__link"><i aria-hidden="true" class="fa fa-phone"></i><span class="contacts-menu__text">+7 345 82 23 57</span></a></div>
          <div class="contacts-menu__li"><a href="#" class="contacts-menu__link"><i aria-hidden="true" class="fa fa-skype"></i><span class="contacts-menu__text">bred</span></a></div>
        </ul>
      </div>
    </div>
  </div>
</div>
<script src="https://use.fontawesome.com/c528a98f8d.js"></script>
</header>

CSS

.container {
  width: 700px;
  margin: 0 auto;
}

.page-header {
  background-color: aquamarine;
  padding-top: 10px;
  padding-bottom: 10px;
  -webkit-box-shadow: 1px 0 3px 0 #d5d5d5;
  box-shadow: 1px 0 3px 0 #d5d5d5;
}

.page-header .container:before,
.page-header .container:after {
  content: " ";
  display: table;
}

.page-header .container:after {
  clear: both;
}

.page-header__left,
.page-header__right {
  width: 50%;
}

@media screen and (max-width: 320px) {
  .page-header__left,
  .page-header__right {
    font-size: 14px;
    width: auto;
  }
}

.page-header__left {
  float: left;
}

.page-header__right {
  text-align: right;
  float: right;
  padding-top: 17px;
}

.page-header__user-avatar {
  display: inline-block;
  vertical-align: middle;
  width: 62px;
  height: 62px;
  -webkit-border-radius: 50%;
  border-radius: 50%;
  border: 1px solid #bebebe;
}

.page-header__user-avatar img {
  -webkit-border-radius: 50%;
  border-radius: 50%;
}

.page-header__user-text {
  display: inline-block;
  vertical-align: middle;
  margin-left: 20px;
}

.page-header__user-text span,
.page-header__user-text i {
  font-style: normal;
}

.page-header__user-text span {
  display: block;
}

.page-header__contacts-link {
  font-family: "fira_sansbold", Helvetica, sans-serif;
  color: #33c1e3;
  background: url('../img/bg-contacts.png') 0 100% repeat-x;
  display: inline-block;
  vertical-align: middle;
}

.page-header__contacts-link:hover,
.page-header__contacts-link:active {
  color: #e85f61;
  background: url('../img/bg-contacts-hover.png') 0 100% repeat-x;
}

.page-header__contacts {
  width: 100%;
  height: 100%;
  display: inline-block;
  text-align: right;
  position: relative;
}

.page-header__dropdown-menu {
  position: absolute;
  text-align: left;
  left: 154px;
}

.page-header__contacts-ul-menu {
  background-color: white;
  border: 1px solid #dedede;
  -webkit-border-radius: 10px;
  border-radius: 10px;
  position:...