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CSS horizontal and vertical centering - 1


Centering the content of a web page in the viewable area of a browser by means of CSS. A box to contain the whole content of the page is CSS centered horizontally and vertically: [ Open demo page ] HTML / XHTML. Code: <!DOCTYPE html> <html> <head> <title>CSS horizontal and vertical centering - 1</title> <link rel="stylesheet" type="text/css" href="css.css" /> </head> <body> <div class="all"> <div class="wrapper"> <div class="pagecontent">&nbsp;</div> </div> </div> </body> </html> CSS. Code: html {height: 100%; margin: 0px;} body height: 100%; margin: 0px;} .all {position: relative; left: 0px; top: 0px; height: 100%; width: 100%; float: left; display: table;} .wrapper {position: relative; left: 0px; top: 0px; height: auto; width: 100%; display: table-cell; vertical-align: middle;} .pagecontent {position: relative; left: 0px; top: 0px; height: 500px; width: 800px; margin: 0 auto; background: #ff6f6f;} The .pagecontent box is for the page content. It may be of height assigned explicitly or just "height: auto". Unlike CSS horizontal and vertical centering - 2, here percents may also be used as CSS units; not just px's or em's. Height and width may be larger than web browser viewable area, but here the more practical case is discussed - when the height and width of .pagecontent are smaller than those of the web browser viewable area. The .pagecontent box is horizontally centered by its "margin: 0 auto". .All with its CSS properties makes the whole web browser viewable area into a CSS table. CSS properties makes .wrapper into the cell of this CSS table. The content of this CSS table cell - the .pagecontent box with everything inside it - is vertically centered in the viewable area of a browser by "vertical-align: middle". [ 1 ] As well as Netscape 7.2+, Mozilla 1.5+. [ 2 ] As well as Netscape 7.2+, Mozilla 1.5+.

Extract tar.gz


Extracting tar.gz files in Linux, command line: tar zxvf file.tar.gz - z : filter the archive through gzip [ 1 ] - x : extract files from an archive - v : list the files processed - f : use archive file The command extracts the contents of a compressed archive to the current directory. Tar creates an archive of one or several files. Then gzip is used to compress it. Or both processes are made at once by tar only, with corresponding options employed. The duality of nature - archived and compressed after - is reflected in the extension of the file ("tar.gz") and requires two procedures to be performed while extracting: decompressing and unpacking. Hence both z (decompress it) and x (unpack it) in the command. [ 1 ] Sources for the option letters description: tar(1) - Linux man page and LinuxCommand.org