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Lighten & Darken with LESS

A Pen By Tim Kjær Lange

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About CSS Preprocessors

CSS preprocessors help make authoring CSS easier. All of them offer things like variables and mixins to provide convenient abstractions.

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CSS Base

About CSS Base

It's a common practice to apply CSS to a page that styles elements such that they are consistent across all browsers. We offer two of the most popular choices: normalize.css and a reset. Or, choose Neither and nothing will be applied.

     

Vendor Prefixing

About Vendor Prefixing

To get the best cross-browser support, it is a common practice to apply vendor prefixes to CSS properties and values that require them to work. For instance -webkit- or -moz-.

We offer two popular choices: Autoprefixer (which processes your CSS server-side) and -prefix-free (which applies prefixes via a script, client-side).

     

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You can also link to another Pen here, and we'll pull the CSS from that Pen and include it. If it's using a matching preprocessor, we'll combine the code before preprocessing, so you can use the linked Pen as a true dependency.

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About JavaScript Preprocessors

JavaScript preprocessors can help make authoring JavaScript easier and more convenient. For instance, CoffeeScript can help prevent easy-to-make mistakes and offer a cleaner syntax and Babel can bring ECMAScript 6 features to browsers that only support ECMAScript 5.

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About ES6 Modules

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If the script you link to has the file extension of a preprocessor, we'll attempt to process it before applying.

You can also link to another Pen here, and we'll pull the JavaScript from that Pen and include it. If it's using a matching preprocessor, we'll combine the code before preprocessing, so you can use the linked Pen as a true dependency.

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HTML

            
                <button type="button" class="btn btn-primary btn-lg">Lighten & Darken with LESS</span>
  </button>
!

CSS

            
              @color-master: #f51669; // ← change this color

@background-color: @color-master;
@text-color: lighten(@color-master, 45%);
@hover-color: lighten(@color-master, 10%);
@body-color: darken(@color-master, 30%);

.btn-primary {
  color: @text-color;
  background: @background-color;
  border: none;
  max-width: 50%;
}

.btn-primary:hover {
  background: @hover-color;
}

body {
  background: @body-color;
  display: flex;
  align-items: center;
  justify-content: center;
  height: 100vh;
}
!

JS
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999px
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Console