I have this form:
<div class="container-fluid">
<div class="span5 well">
<h2>Authentification</h2>
<form method="POST">...</form>
</div>
</div>
How I can center that block (div span5 well) vertically and horizontally? Thank you.
可以通过向没有兄弟节点的元素添加margin: 0 auto
来完成水平居中。
<style>
.well
{
position:absolute;
width:200px;
height:200px;
top: 50%;
left: 50%;
margin-top:-100px; /* negative number 1/2 height */
margin-left:-100px; /* negative number 1/2 width */
outline:1px solid #CCC;
}
</style>
<div class="container-fluid">
<div class="span5 well">
<h2>Authentification</h2>
<form method="POST">...</form>
</div>
</div>
There's nothing conflicting with Bootstrap to use some JS for this, such as this guy's JQuery.vAlign plugin . I find that more straight-forward than the vertical-align tricks.
Horizontal centering was mentioned earlier to set margin 0 auto.
To vertically align the element dynamically (when you don't know the height) you can relatively shift it 50% (up or down) and then use transform: translateY(50%) (+/-) to center it within its parent container:
div.span5 {
margin: 0 auto;
top:50%;
width:400px;
position:relative;
transform: translateY(-50%);
}
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