如何在可变宽度的较小div中水平居中可变宽度的较大div [英] How to horizontally center a larger div of variable width, within a smaller div of variable width

问题描述

我想达到以下效果：）。

查看此示例： http://jsfiddle.net / 2SQ4S / 1 /

I want to achieve the following effect: http://jsfiddle.net/3KJta/1/

However the solution I have uses a known width for the small div and the larger div. I need this to work with variable sized divs. The use case for this is a tooltip that appears above a smaller flexible sized element. The tooltip content isn't known and so the width could be anything.

So far I have:

<div class="small">
    <div class="smaller"></div>
    <div class="larger"></div>
</div>

and

* {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

div {
    border: 2px solid black;
}

.small {
    width: 50px;
    height: 50px;
    position: absolute;
    left: 200px;
    top: 50px;
    text-align: center;
}

.smaller {
    width: 20px;
    height: 20px;
    border-color: red;
    display: inline-block;
}

.larger {
    width: 200px;
    height: 200px;
    border-color: blue;
    display: inline-block;
    margin-left: -75px /* NOTE: in reality, .small has a variable width, and so does .larger, so i can't just take off this fixed margin */
}

解决方案

If you are ok with using css3 and only support modern browsers you can use transform: translateX(-50%); to center the bigger box (currently supported browsers).

See this example: http://jsfiddle.net/2SQ4S/1/

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