Sass

Sass is the most mature, stable, and powerful professional grade CSS extension language in the world.

Sass 홈페이지

Modules

// _base.scss
$font-stack: Helvetica, sans-serif;
$primary-color: #333;

body {
  font: 100% $font-stack;
  color: $primary-color;
}

// styles.scss
@use 'base';

.inverse {
  background-color: base.$primary-color;
  color: white;
}

위 코드는 아래 코드와 같음

body {
  font: 100% Helvetica, sans-serif;
  color: #333;
}

.inverse {
  background-color: #333;
  color: white;
}

Mixins

@mixin theme($theme: DarkGray) {
  background: $theme;
  box-shadow: 0 0 1px rgba($theme, .25);
  color: #fff;
}

.info {
  @include theme;
}
.alert {
  @include theme($theme: DarkRed);
}
.success {
  @include theme($theme: DarkGreen);
}

위 코드는 아래 코드와 같음

.info {
  background: DarkGray;
  box-shadow: 0 0 1px rgba(169, 169, 169, 0.25);
  color: #fff;
}

.alert {
  background: DarkRed;
  box-shadow: 0 0 1px rgba(139, 0, 0, 0.25);
  color: #fff;
}

.success {
  background: DarkGreen;
  box-shadow: 0 0 1px rgba(0, 100, 0, 0.25);
  color: #fff;
}

Extend/Inheritance

/* This CSS will print because %message-shared is extended. */
%message-shared {
  border: 1px solid #ccc;
  padding: 10px;
  color: #333;
}

// This CSS won't print because %equal-heights is never extended.
%equal-heights {
  display: flex;
  flex-wrap: wrap;
}

.message {
  @extend %message-shared;
}

.success {
  @extend %message-shared;
  border-color: green;
}

.error {
  @extend %message-shared;
  border-color: red;
}

.warning {
  @extend %message-shared;
  border-color: yellow;
}

Operators

@use "sass:math";

.container {
  display: flex;
}

article[role="main"] {
  width: math.div(600px, 960px) * 100%;
}

aside[role="complementary"] {
  width: math.div(300px, 960px) * 100%;
  margin-left: auto;
}

@if and @else

@if

@mixin avatar($size, $circle: false) {
  width: $size;
  height: $size;

  @if $circle {
    border-radius: $size / 2;
  }
}

.square-av {
  @include avatar(100px, $circle: false);
}
.circle-av {
  @include avatar(100px, $circle: true);
}

위 코드는 아래 코드와 같음

.square-av {
  width: 100px;
  height: 100px;
}

.circle-av {
  width: 100px;
  height: 100px;
  border-radius: 50px;
}

@else

$light-background: #f2ece4;
$light-text: #036;
$dark-background: #6b717f;
$dark-text: #d2e1dd;

@mixin theme-colors($light-theme: true) {
  @if $light-theme {
    background-color: $light-background;
    color: $light-text;
  } @else {
    background-color: $dark-background;
    color: $dark-text;
  }
}

.banner {
  @include theme-colors($light-theme: true);
  body.dark & {
    @include theme-colors($light-theme: false);
  }
}

위 코드는 아래 코드와 같음

.banner {
  background-color: #f2ece4;
  color: #036;
}
body.dark .banner {
  background-color: #6b717f;
  color: #d2e1dd;
}

@else if

@use "sass:math";

@mixin triangle($size, $color, $direction) {
  height: 0;
  width: 0;

  border-color: transparent;
  border-style: solid;
  border-width: math.div($size, 2);

  @if $direction == up {
    border-bottom-color: $color;
  } @else if $direction == right {
    border-left-color: $color;
  } @else if $direction == down {
    border-top-color: $color;
  } @else if $direction == left {
    border-right-color: $color;
  } @else {
    @error "Unknown direction #{$direction}.";
  }
}

.next {
  @include triangle(5px, black, right);
}

위 코드는 아래 코드와 같음

.next {
  height: 0;
  width: 0;
  border-color: transparent;
  border-style: solid;
  border-width: 2.5px;
  border-left-color: black;
}

Interpolation

@mixin corner-icon($name, $top-or-bottom, $left-or-right) {
  .icon-#{$name} {
    background-image: url("/icons/#{$name}.svg");
    position: absolute;
    #{$top-or-bottom}: 0;
    #{$left-or-right}: 0;
  }
}

@include corner-icon("mail", top, left);

위 코드는 아래 코드와 같음

.icon-mail {
  background-image: url("/icons/mail.svg");
  position: absolute;
  top: 0;
  left: 0;
}