vertically centering a child insdie a div

Quick question ,

now suppose i have the following code

<div>
    <button class="btn btn-success">startquiz</button>
</div>

to center the button horizontally , what i do is in CSS i give the following code

div{
   text-align:center;
   height:400;
}

"text-align:center;" does the trick of centering the botton inside teh div in the center , horizontally , now see that the div is actually 400px in height . how do i vertically center the button in the center ?

Issue with clearing left and right floats within the same DIV

Hey everyone! Thanks in advance for your help. I've been a long time lurker and I finally have an issue I couldn't solve by just searching the forum...

I'll try to make this as clear as possible. First, a brief description..

Difficulties with two div containers embedded inside another div

Hello I have some tags you will not recognize in html, however, it does work when I load it from my editor/processor (the tags that seem foreign). My main problem is that I have a div called wrap containing both menu and content divs. These divs has classes called panel and panel content (menu has panel content/content has no content class associated with it.) My main problem is that I cannot get the div called content to appear in the correct position when juxtaposed with menu. The only thing I can do to make it display properly is to put an absolute tag on it.

How to cancel a CSS image tag for only one image inside a <div>?

HI! I am very unexperienced in css, and am currently trying a few things for my website to understand its concept. The website is pretty simple, and the layout works fine, but I have one problem.

conflict table within a div and css not applies

Hi all of you,

I have just joined the CSS creator community looking for advice and help. I would like to help other if possible, although I am kinda new bee with css. Smile

So, the thing is that I don't know what I am doing wrong, but I cannot make a css to apply to a table which is displaying results from my mysql. You can see it live by yourself here. Just tick a box in the form and the results will be displayed below (if needed scroll a bit down)

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