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CSS position 相对定位和绝对定位 菜鸟教程
Web示例:一个父div(400px;h:400px)中有一个子div(w:100px;h:100px;)。让其上下左右居中。方法一:使用line-height属性 理念:当父div的行高等于自身高度时,内部的行内元素会上下居中显示。行内块没有固定高度时也会… WebW3Schools offers free online tutorials, references and exercises in all the major languages of the web. Covering popular subjects like HTML, CSS, JavaScript, Python, SQL, Java, and many, many more. citytrip rotterdam
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