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CSS Reference. Position. In order to make more complex layouts, we need to discuss the position property.

position

It has a bunch of possible values, and their names make no sense and are impossible to remember. Let's go through them one by one, but maybe you should bookmark this page too. static static is the default value. An element with position: static; is not positioned in any special way. Relative relative behaves the same as static unless you add some extra properties. Setting the top, right, bottom, and left properties of a relatively-positioned element will cause it to be adjusted away from its normal position. Fixed Hello! A fixed element is positioned relative to the viewport, which means it always stays in the same place even if the page is scrolled. I'm sure you've noticed that fixed element in the lower-right hand corner of the page. A fixed element does not leave a gap in the page where it would normally have been located. Mobile browsers have surprisingly shaky support for fixed.

Absolute. All About Floats. By Chris Coyier On What is "Float"?

All About Floats

Float is a CSS positioning property. To understand its purpose and origin, we can look to print design. In a print layout, images may be set into the page such that text wraps around them as needed. This is commonly and appropriately called "text wrap". In page layout programs, the boxes that hold the text can be told to honor the text wrap, or to ignore it. In web design, page elements with the CSS float property applied to them are just like the images in the print layout where the text flows around them. Setting the float on an element with CSS happens like this: There are four valid values for the float property. What are floats used for? Aside from the simple example of wrapping text around images, floats can be used to create entire web layouts. Floats are also helpful for layout in smaller instances. This same layout could be accomplished using relative positioning on container and absolute positioning on the avatar as well.

CSS Box Model. Opacity. The opacity property in CSS specifies how transparent an element is.

opacity

Basic use: Opacity has a default initial value of 1 (100% opaque). Opacity is not inherited, but because the parent has opacity that applies to everything within it. You cannot make a child element less transparent than the parent, without some trickery. Values are a number from 0 to 1 representing the opacity of the channel (the "alpha" channel). IE Compatibility If you want opacity to work in all versions of IE, the order should be as follows: If you don’t use this order, IE8-as-IE7 doesn’t apply the opacity, although IE8 and a pure IE7 do.

Note on Stacking Contexts If an element with opacity and a value less than 1 is positioned, the z-index property applies as described in CSS2.1, except that the auto value is treated as 0 since a new stacking context is always created. Opacity can be used as an alternative to the visibility property: visibility: hidden; is just like opacity: 0;. Related Properties Color Other Resources. Non-Transparent Elements Inside Transparent Elements. Reader Shane left a comment: If using transparency on a block element it makes the text inside transparent as well.

Non-Transparent Elements Inside Transparent Elements

Is there a way I can prevent that from happening? I tried putting the text in another div and setting the opacity to 100%, but that didn't do the job. Although, logically, I thought it would! Logically, that makes sense to me to. First, you create a bar making sure to use the CSS settings for all browsers. <div class="bar"><h2>Some mild-mannered text trapped inside a bar.

And this is how you style it: This is where you notice that the text inside the bar as taken on the transparency of the bar itself. You'll have to resort to some trickery. As far as I know, there is just no way to force those child elements to be an less transparent than their parent element. As you likely know, just because an element occupies the same space as another element, doesn't make one a child of the other. Here is how we'll do it: <h2 class="ontop">Haha!