）（私はあなたのターゲットブラウザ（s）が何であるか、またはあなたが持っている他のどのような制限が分かりませんが、絶対位置& CALCで、このようにそれを行うことができます。実際には、イメージをテキストの中央に置くことに気をつけなければ、calc（）も必要ありません。
.container {
position: relative;
margin: 50px 0 0 25px;
}
img {
position: absolute;
height: 200px;
top: calc(50% - 100px);
left: calc(50% - 100px);
}
<div class='container'>
<p>
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</p>
<p>
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</p>
<p>
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</p>
<p>
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</p>
<p>
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</p>
<img src="http://makemomentum.com/wp-content/uploads/2013/04/puking-rainbow-square.jpg" />
</div>
真CSSの忍者は、おそらくより良い方法を持っていますが、私の理解から、あなたは絶対位置のようなもので、通常のドキュメントフローからそれを取得する必要がありますか、あなたが試みることができます負のマージンを使用する
マイナスの「margin-top」 – theblindprophet