Css tech to horizontal align text div with word wrapable

index.html

<div class="sidebar-top-author">
    <img class="author-avatar" src="images/avatar.png" alt="">
    <div class="author-name">
        <div class="author-name-inner">
            <span class="author-name-text">Duoc Nguyen</span>
        </div>
    </div>
</div>

style.css

.sidebar .sidebar-top {
  height: 8.9rem;
  width: 100%;
  background: #2ECC71;
  position: relative;
}
.sidebar .sidebar-top .sidebar-top-author {
  height: 4.8rem;
  width: 16.8rem;
  margin: auto;
  position: absolute;
  left: 0;
  right: 0;
  margin-left: auto;
  margin-right: auto;
  top: 0;
  bottom: 0;
  margin-top: auto;
  margin-bottom: auto;
}
.sidebar .sidebar-top .sidebar-top-author .author-avatar {
  height: 4.8rem;
  width: 4.8rem;
}
.sidebar .sidebar-top .sidebar-top-author .author-name {
  height: 4.8rem;
  width: 10.8rem;
  overflow: hidden;
  display: inline-block;
  position: absolute;
  margin-left: 1.2rem;
  top: 0;
  bottom: 0;
  margin-top: auto;
  margin-bottom: auto;
}
.sidebar .sidebar-top .sidebar-top-author .author-name .author-name-inner {
  display: table;
  height: 100%;
}
.sidebar .sidebar-top .sidebar-top-author .author-name .author-name-inner .author-name-text {
  font-family: "Proxima Nova";
  font-size: 1.3rem;
  color: #FFFFFF;
  text-transform: uppercase;
  letter-spacing: 0.05rem;
  display: table-cell;
  vertical-align: middle;
}