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HTML

              
                <div class="tbl">
  <div class="cell">
    <a href="https://twitter.com/home?status=https%3A%2F%2Fcdpn.io%2FqOeyOx" target="_blank" class="tweet">
      <i></i>
      <span>Tweet</span>
    </a>
  </div>
</div>
              
            
!

CSS

              
                html, body
  height 100%

*
  box-sizing border-box

.tweet
  position relative
  display inline-block
  height 20px
  padding 0 6px
  color #fff
  cursor pointer
  background-color #1b95e0
  border-radius 3px
  box-sizing border-box
  text-decoration none
  transition background-color .2s ease
  //transform scale(1)
  i
    position relative
    top 4px
    display inline-block
    vertical-align top
    width 18px
    height 11px
    background-image url("http://andreasstorm.com/lib/tweet.svg")
    background-repeat no-repeat
    background-position 0 0
    background-size 144px 11px  
  span
    position relative
    top 4px
    left -2px
    vertical-align top
    font-family 'Helvetica Neue', Arial, sans-serif
    font-weight 500
    font-size 11px
  &:hover
    background-color #0c7abf
    i
      animation tweet .6s steps(7) infinite

.tbl
  display table
  width 100%
  height 100%

.cell
  display table-cell
  vertical-align middle
  text-align center

@keyframes tweet
  100%
    background-position -126px 0
              
            
!

JS

              
                // Not allowed: 

// more -> https://about.twitter.com/company/brand-assets
              
            
!
999px

Console