php - Simple Color Variation -

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I am creating a UI in which the user has the ability to change the color values ​​of their pages. What do I want to take the value assigned to their background color and make it lighten a certain amount? I am trying to get only a highlights line without creating new images at all times.

Example: Users Sets the background color to #ECECEC Now I have to create a certain element limit # F4F4F4 (one color to white).

Please tell me whether this is a good way to do this with JavaScript, PHP, or even jQuery.

Code> Limit: 1 px solid RGBA (255,255,255,0.7)

This will have a white border of 70% opacity Unfortunately, it is supported in Firefox 2, Opera 9 or any version of IE is not. It will not be difficult to make alternative versions for these browsers. Example of jQuery: 

  $ ('body'). Append ('& lt; div id = "rgbatest" style = "color: rgba (0,0,0,0,0); condition: absolute (' $ '(' # rgbatest ') .css (' color ') Match (/ ^ RGBA /)) {$ ('(' no-rgba ');} $ (' # rgbatest '). Remove ();

From here, you Override RGBA color can use no-rgba class. 

  #thisDiv {boundary: 1 px solid RGBA (255,255,255,0.7)} .no-rgba #thisDiv {border: 1 px solid #FFF}

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