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    <p>Assuming you remain with wanting to theme it within one style sheet (and not multiple sheets as cimmanon noted in the comments), and assuming you are using LESS 1.3.2+, then the following code works to reduce the amount of duplication by setting up a loop through the classes that need theme changes. </p> <p>Note that this does not work on Codepen (it is throwing an error <code>uncaught throw #</code>, perhaps because they are running an earlier version of LESS), but you can see it compiling correctly by putting the code into <a href="http://less2css.org/" rel="noreferrer">LESS's compiler</a>.</p> <p><strong>LESS (based off your Codepen code with an added theme for demo)</strong></p> <pre><code>////////////////////////////////////////////////////// // CONSTANTS @lightColour: #fff; @darkColour: #000; @lightBg: #fff; @darkBg: #000; @numberOfThemes: 3; //controls theme loop ////////////////////////////////////////////////////// // MIXINS //Theme Definitions by parametric mixin numbers (1), (2), etc. .themeDefs(1) { @lightColour: #f00; @darkColour: #fff; @lightBg: #f00; @darkBg: #fff; } .themeDefs(2) { //inverse of 1 @lightColour: #fff; @darkColour: #f00; @lightBg: #fff; @darkBg: #f00; } .themeDefs(3) { @lightColour: #cfc; @darkColour: #363; @lightBg: #cfc; @darkBg: #363; } .curvy { -moz-border-radius: 5px; -webkit-border-radius: 5px; border-radius: 5px; } ////////////////////////////////////////////////////// // GENERAL STYLING * {padding: 0;margin: 0;} html {text-align: center;} h2 {padding: 20px 0;} .box { .curvy; color: @lightColour; background: @darkBg; display:inline-block; width:10%; padding:20px 5%; margin:0 1% 20px 1%; } ////////////////////////////////////////////////////// // THEME BUILDING .buildThemes(@index) when (@index &lt; @numberOfThemes + 1) { .theme-@{index} { .themeDefs(@index); color: @lightColour; background: @darkBg; .box { color: @darkColour; background: @lightBg; } } .buildThemes(@index + 1); } //stop loop .buildThemes(@index) {} //start theme building loop .buildThemes(1); </code></pre> <p><strong>CSS Output (only showing the looped theme css for brevity)</strong></p> <pre><code>.theme-1 { color: #ff0000; background: #ffffff; } .theme-1 .box { color: #ffffff; background: #ff0000; } .theme-2 { color: #ffffff; background: #ff0000; } .theme-2 .box { color: #ff0000; background: #ffffff; } .theme-3 { color: #ccffcc; background: #336633; } .theme-3 .box { color: #336633; background: #ccffcc; } </code></pre>
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    1. COThanks very much for this ScottS. I'll try that out with the correct version of LESS. This code snippet will be very handy for me in future, especially for smaller areas of CSS. I think it will be a case of taking both your and cimmanon's comments on board in future and deciding on the best solution for the given task. Thanks for both of your answers.
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