JSFiddle - React, Tailwind, and code Playground

by Serg Sagan

HTML

<div class="header__login">
  <a href="#" class="login__vk">Войти через<img class="login__vk-pic" src="http://s32.postimg.org/l7ulie6yp/image.png" alt=""></a>
</div>

CSS

.header__login{
  width: 40%;
  height: 50px;
  border: 1px solid;
  position: relative;
}
.login__vk-pic{
  position: absolute;
  top: 0;
  left: 0;
  bottom: 0;
  right: 0;
  margin: auto;
  max-width: 100%;
  max-height: 100%;
}