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Set everything up as you would if you want to position: absolute inside a position: relative container, and then create a new fixed position div inside the div with position: absolute , but do not set its top and left properties. It will then be fixed wherever you want it, relative to the container.
The absolute positioning is best if you need something the be placed at an exact coordinate. The relative positioning will take where the element already is, and add the coordinates to it.
Fixed positioning This can be used to create a "floating" element that stays in the same position regardless of scrolling. In the example below, box "One" is fixed at 80 pixels from the top of the page and 10 pixels from the left. Even after scrolling, it remains in the same place relative to the viewport.
Using width, max-width and margin: auto; Then, you can set the margins to auto, to horizontally center the element within its container. The element will take up the specified width, and the remaining space will be split equally between the two margins: This <div> element has a width of 500px, and margin set to auto.
Considering:
Is it best for maximum browser compatibility to set a width in pixels for the element, or simply use left and right?
Any common bugs to watch out for with either method?
Clearly, using left: 0; and right: 0; would make the code more manageable in cases where the image's width or padding were to change, but are there any downsides where width: 300px would be favorable instead?
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