Why does z-index not work?

The z-index property only works on elements with a position value other than static (e.g. position: absolute;, position: relative;, or position: fixed). There is also position: sticky; that is supported in Firefox, is prefixed in Safari, worked for a time in older versions of Chrome under a custom flag, and is under consideration by Microsoft to add to their Edge browser.

How do I center floated elements?

Removing floats, and using inline-block may fix your problems: (remove the lines starting with – and add the lines starting with +.) Show code snippet inline-block works cross-browser, even on IE6 as long as the element is originally an inline element. Quote from quirksmode: An inline block is placed inline (ie. on the same line … Read more

Draw Circle using css alone [duplicate]

You could use a .before with a content with a unicode symbol for a circle (25CF). Expand snippet I suggest this as border-radius won’t work in IE8 and below (I recognize the fact that the suggestion is a bit mental).

What is difference between png8 and png24

I want to know about uses of png files. There are two formats available for png images; one is png8 and the another one is png24. I would like to know that if I use either type in my html page, will there be any error? Or is this only quality matter?

CSS opacity only to background color, not the text on it?

It sounds like you want to use a transparent background, in which case you could try using the rgba() function: rgba(R, G, B, A) R (red), G (green), and B (blue) can be either <integer>s or <percentage>s, where the number 255 corresponds to 100%. A (alpha) can be a <number> between 0 and 1, or … Read more

multiple classes on single element html

Is it a good practice to use many classes on one single HTML element? For example: I don’t mean that two or three classes on one element is bad, but how about four, five or even six?

Is there a color code for transparent in HTML?

There is not a Transparent color code, but there is an Opacity styling. Check out the documentation about it over at developer.mozilla.org You will probably want to set the color of the element and then apply the opacity to it. You can use some online transparancy generatory which will also give you browser specific stylings. … Read more

How do I vertically center text with CSS?

You can try this basic approach: Expand snippet It only works for a single line of text though, because we set the line’s height to the same height as the containing box element. A more versatile approach This is another way to align text vertically. This solution will work for a single line and multiple … Read more