Why won't my Div center itself in its parent?

问题

I am making a header bar for a website. This header bar consists of 3 parts: The Back Button, The School Information, and The Login Button. The problem is that the center div, the School Information, will not center itself. I've tried everything I know how to do and nothing works.

Here is my HTML and CSS:

/* -- Button Bar -- */

.buttonbarframe {
    width: 100%;
    background-color: #F1F1F1;
	border-bottom: 1px solid #D5D5D5;
	box-shadow: 1px 1px 2px #D5D5D5;
	position: fixed;
	left: 0;
	right: 0;
	top: 0;
	/*height: 65px;*/
	height: 45px;
	
    padding: 10px 0px 10px 0px;
}

/*#buttonbar {
    width: 100%;
	height: 45px;
	padding: 10px 0px 10px 0px;
}*/

.buttonbarspan {
    height: 100%;
}

.buttonbarspanindex {
    width: inherit;
    height: 100%;
	margin: 0px;
}

#buttonbarschoolimage {
    display: block;
    float: left;
	vertical-align: middle;
	height: 44px;
	border: 1px solid #D5D5D5;
}

#buttonbarschoolname {
    display: block;
	padding: 0px;
	margin-top: 4px;
	text-align: left;
	vertical-align: middle;
	float: left;
}

.buttonbarrightbutton {
    display: block;
    float: right;
}

.buttonbarsycamorelogo {
    margin: 0 auto;
    display: block;
	text-align: center;
	vertical-align: middle;
	height: 44px;
}

.schoolstuff {
    display: inline-block;		
    margin: 0 auto;
	text-align: center;
	vertical-align: middle;
	width: 341px;
}

.rightbutton {
    float: right;
}

.leftbutton {
    float: left;
}

<div class='buttonbarframe'>
    <div class='leftbutton buttonbarspan'>
        <a class='backbutton btn btn-large btn-danger' href=''><i class='icon-white icon-arrow-left'></i> Logout</a>
    </div>
    <div class='schoolstuff buttonbarspan'>
        <img id='buttonbarschoolimage' src='/Schools/$EntityValue/logo'>
        <h2 id='buttonbarschoolname'>Tri-County School</h2>
    </div>
    <div class='rightbutton buttonbarspan'>
        <input type='submit' class='buttonbarrightbutton btn btn-large btn-primary' href='parentcheckin.php' value='Login'>
    </div>
</div>

Here is an example of the problem.

Image of the problem. http://www.overclock.net/image/id/6330507/width/900/height/900/flags/LL

回答1:

Putting text-align: center on the parent div will fix this issue. What you have right now centers the text in the div which should already be centered.

see: http://jsfiddle.net/AJmSw/

Inline-block elements will be positioned based on the parent containers text align. With both your side divs floating this will work fine.

Alternatively removing the display: inline-block rule from the center div will allow the margin: 0 auto; to take effect also centering the div see: http://jsfiddle.net/b4mWU/

回答2:

Bootstrap was being stupid. There was a CSS problem that flew under the radar for me. Thanks for the help guys.

来源：https://stackoverflow.com/questions/17999398/why-wont-my-div-center-itself-in-its-parent

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