水平居中元素內的元素

Question

爲了簡單起見，假設您有一個寬度爲100px的div，並且其中每個寬度爲20px的3個div。我如何將它們對齊到div對齊的位置，留下20像素;每邊都有缺口？

Answer 1

中心一些HTML元素總是取決於你的項目和集成的依賴......

你可能會很樂意與這些2個解決方案，顯示：inline-block的;和float：left;

兩者都有優點&缺點，希望它能幫助你！

http://jsfiddle.net/HP2DS/1/

<!-- Inline-block --> 
<div id='container'> 
    <div class='centered' id='content-left'></div><div class='centered' id='content-center'></div><div class='centered' id='content-right'></div> 
</div> 

#container { 
    width: 100px; 
    height: 80px; 
    text-align: center; 
    background: cyan; 
} 

#container .centered { 
    display: inline-block; 
    width: 20px; 
    height: 100%; 
    margin: auto; 
    background: magenta; 
    border: 1px solid black; 
    box-sizing: border-box; 
} 

<!-- Floating --> 
<div id='container-2'> 
    <div class='centered' id='content-2-left'></div> 
    <div class='centered' id='content-2-center'></div> 
    <div class='centered' id='content-2-right'></div> 
</div> 

#container-2 { 
    width: 60px; /* 60px + 2*20px of padding... */ 
    height: 80px; 
    padding: 0 20px; 
    text-align: center; 
    background: cyan; 
} 

#container-2 .centered { 
    float: left; 
    width: 20px; 
    height: 100%; 
    margin: auto; 
    background: magenta; 
    border: 1px solid black; 
    box-sizing: border-box; 
} 

Answer 2

美好的一天！這裏是我是如何實現它：

HTML

<div id="container"> 
    <div class="child"></div> 
    <div class="child"></div> 
    <div class="child"></div> 
</div> 

CSS

#container { 
    width: 100px; 
    height: 100px; 
    border: 1px solid red; /** for viewing purposes **/ 
    text-align: center; /** center the divs **/ 
    font-size: 0; /** remove the unwanted space caused by display: inline-block in .child **/ 
} 

#container .child { 
    display: inline-block; /** set the divs side-by-side **/ 
    vertical-align: top; 
    width: 20px; 
    height: 100px; 
    font-size: 12px; /** override font-size: 0 of #container, so that text will be visible again **/ 
    text-align: left; /** set text in the .child divs back to normal alignment **/ 
    border: 1px solid blue; /** for viewing purposes **/ 
    box-sizing: border-box; 
} 

我希望這有助於。乾杯! :)