<html><head> <style> *{margin:0;padding:0} .box { position: absolute; width:100%; height:100%; background-color:gray; text-align: center; } .middle{ padding:3px; background-color: orange; } .box:after{ display:inline-block; height:100%; content:''; vertical-align: middle; } </style></head><body> <div class="box"> <span class="middle">行內(nèi)元素</span> </div></body></html>
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