<div class="spinner-container">
  <div class="spinner-spacer"></div>
  <div class="mdl-spinner mdl-js-spinner is-active"></div>
  <div style="spinner-spacer"></div>
</div>
.spinner-container {
    align-items: center;
    display: flex;
}

.spinner-spacer {
    width: 50%;
}
Rerun