How to resize a image proportionally with CSS
To resize a image proportionally with CSS, simply set either width or height to auto. This should also work if the img html tag has width and height attributes set.
How to switch a div background image in jQuery
To switch a div background image in jQuery you can use the following snippet. Sample jQuery
How to fit image size to div size in HTML
To fit image size to div size in HTML you need to set max-width and max-height without applying an explicit width or height. Sample HTML
How to resize a image in PHP
To resize a image in PHP you can use the following snippet. Sample PHP