div style width 100 height 100 position fixed top left display table d

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<div style="width: 100%;height: 100%;position: fixed;top: 0;left: 0;display: table;">
<div style="display: table-cell;vertical-align: middle;text-align: center;">
<span style="background: rgba(52, 73, 94, 0.59);padding: .7em;border-radius: 10px;color: #ecf0f1;font-size: 2em;">
250ms
</span>
</div>
</div>