Introduction to PreCSS

PreCSS is a powerful preprocessor for CSS, enabling a variety of advanced features that simplify writing and maintaining stylesheets. With PreCSS, you can utilize variables, mixins, nested rules, and more, promoting cleaner and more efficient code.

Useful API Examples

Variables

With variables, you can store reusable values like colors, font sizes, and any CSS value, which makes it easier to manage and update your styles.

 $primary-color: #3498db; $font-stack: 'Helvetica Neue', sans-serif;
body {
  color: $primary-color;
  font-family: $font-stack;
} 

Mixins

Mixins allow you to create reusable blocks of code. They simplify complex styles and ensure consistency throughout the stylesheet.

 @mixin border-radius($radius) {
  -webkit-border-radius: $radius;
     -moz-border-radius: $radius;
      -ms-border-radius: $radius;
          border-radius: $radius;
}
.box { @include border-radius(10px); } 

Nested Rules

Nesting helps in organizing CSS by reflecting the HTML structure, making it more readable and maintainable.

 nav {
  ul {
    margin: 0;
    padding: 0;
    list-style: none;

    li { display: inline-block; }
  }
} 

Extend/Inheritance

Using extend feature, you can share sets of CSS properties from one selector to another.

 %center {
  display: flex;
  justify-content: center;
  align-items: center;
}
.header {
  @extend %center;
  height: 100px;
  background-color: #333;
}
.footer {
  @extend %center;
  height: 50px;
  background-color: #666;
} 

Application Example

Below is an application example using the introduced PreCSS features.

 $primary-color: #e74c3c; $secondary-color: #2ecc71; $font-stack: 'Arial', sans-serif;
@mixin box-shadow($x, $y, $blur, $color) {
  -webkit-box-shadow: $x $y $blur $color;
          box-shadow: $x $y $blur $color;
}
%center {
  display: flex;
  justify-content: center;
  align-items: center;
}
body {
  font-family: $font-stack;
  background: $secondary-color;

  header {
    @extend %center;
    background: $primary-color;
    width: 100%;
    height: 60px;

    h1 {
      color: #fff;
    }
  }

  .container {
    margin: 20px auto;
    padding: 20px;
    width: 80%;
    background: #fff;
    @include box-shadow(0, 0, 10px, rgba(0,0,0,0.1));
  }
} 

With PreCSS, managing and maintaining your stylesheets becomes significantly more efficient and enjoyable. Integrate these powerful features into your workflow to take your CSS to the next level.

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