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<!DOCTYPE html>
<html >
<head>
    <meta charset="UTF-8">
    <style type="text/css">
        #box {
            width: 400px;
            height: 100px;
            border: 1px solid #000;
            text-align: center;
        }
        .helper {
            display: inline-block;
            height: 100%;
            /* vertical-align은 다른 인라인 요소에 상대적으로 정렬한다. 
                그 상대적 정렬 기준역활을 하는 helper클래스를 이용했다. */
            vertical-align: middle;
        }
        
        .txt {
            vertical-align: middle;
        }
    </style>
</head>
<body>
    <div id="wrapper">
        <div id="box">
            <span class="helper"></span><span class="txt">텍스트</span>
        </div>
    </div>
</body>
</html>


.helper:before{

    content: "";

    display: inline-block;

    height: 100%;

    vertical-align: middle;

}

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Posted by 힘없는염소