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HTML

              
                <button id="background-toggle" class="toggle">Toggle<br />Bkg.</button>

<h1>Working with a component</h1>


<hr />


<h2>Action row component</h2>

<div class="action-row">
  <button class="button button--primary button--medium button--solid">Upload file</button>
  <button class="button button--tertiary button--medium button--hollow">Cancel</button>
</div>
              
            
!

CSS

              
                ///////////////////////////////
// ELEMENT LOGIC             //
// Element starts on line 53 //
///////////////////////////////

// Breakpoints:
$bp-lap: 37.5em;  // 600px @ 16px

// Background variables
$background-light: #fefbef;
$background-dark: #403f3c;

// Color variables
$type-light: $background-light;
$type-dark: $background-dark;
$button-color-primary-light: #ff4136;
$button-color-secondary-light: #357edd;
$button-color-tertiary-light: #808080;
$button-color-primary-dark: #ff6347;
$button-color-secondary-dark: #1e90ff;
$button-color-tertiary-dark: #939393;

// Transform variables
$button-bounce: scale(0.98);

// Transition variables
$button-transition-duration: 300ms;
$button-cycle-busy: 2s ease-in-out infinite;

// Border variables
$button-border-width-thin: 2px;
$button-border-width-thick: 3px;

// Animation
@keyframes button-busy {
  0% { opacity: 0.2; }
  50% { opacity: 0.4; }
  100% { opacity: 0.2; }
}








/////////////////////
// ELEMENT STYLING //
/////////////////////

// Declared as a class so we can easily apply it to both `<button>` and `<input type="button">`
.button {

  /////////////////////
  // CORE FORMATTING //
  /////////////////////
  background-color: transparent;
  border: 0;
  color: $type-light;
  font-family: 'Open Sans', sans-serif;
  font-weight: 600;
  line-height: 1;
  margin-top: 1.5rem;
  transition:
   background-color $button-transition-duration, // Solid buttons
   border-color $button-transition-duration, // Hollow buttons
   box-shadow ($button-transition-duration / 2); // Focused buttons
  width: 100%; // Large, mobile-friendly touch target

  // States
  // All states share these core properties
  &:focus {
    outline: none; // Make sure every priority has a visually distinct focus style!
  }

  // Make buttons feel "tappy"
  &:active {
    transform: $button-bounce;
    transition: none;
  }

  // Disabled styles use the`!important` qualifier because they are a "fixed" trump state that should not be manipulated until the reason for disabling the element has been satisfied: https://csswizardry.com/2016/05/the-importance-of-important/
  &[aria-busy="true"] {
    animation: button-busy $button-cycle-busy !important;
    cursor: not-allowed !important;
    pointer-events: none !important;

    &:focus {
      box-shadow: none !important;
    }

    &:active {
      transform: none !important;
    }
  }

  &[disabled] {
    cursor: not-allowed !important;
    opacity: 0.3 !important;
    pointer-events: none !important;
  }

  // Contexts
  // All contexts share these core properties
  .background--dark & {
    color: $type-dark;
  }

  // Media Queries
  @media (min-width: $bp-lap) {
    width: auto; // Smaller buttons on larger screens
    padding-left: 2rem;
    padding-right: 2rem;
    margin-left: 1rem;
    margin-right: 1rem;
  }

  ////////////////
  // PRIORITIES //
  ////////////////
  // Primary buttons
  // `#{&}` interpolates the ampersand selector, letting you target multiple classes on the same element: https://webdesign.tutsplus.com/tutorials/all-you-ever-need-to-know-about-sass-interpolation--cms-21375  
  &--primary#{&}--solid,
  &--primary#{&}--hollow {

    // States
    &:focus {
      box-shadow:
       0 0 0 $button-border-width-thick $background-light,
       0 0 0 ($button-border-width-thin * 2.5) $button-color-primary-light;
    }

    // Contexts
    .background--dark & {
      &:focus {
        box-shadow:
         0 0 0 $button-border-width-thick $background-dark,
         0 0 0 ($button-border-width-thin * 2.5) $button-color-primary-light;
      }
    }
  }

  &--primary#{&}--solid {
    background-color: $button-color-primary-light;

    // States
    &:hover {
      background-color: lighten($button-color-primary-light, 7%);
    }

    &:active {
      background-color: darken($button-color-primary-light, 7%);
    }

    &[disabled] {
      &:hover {
        background-color: $button-color-primary-light !important;
      }
    }
  }

  &--primary#{&}--hollow {
    color: $button-color-primary-light;
    border: $button-border-width-thick solid $button-color-primary-light;

    // States
    &:hover {
      border-color: lighten($button-color-primary-light, 7%);
      color: lighten($button-color-primary-light, 7%);
    }

    &:active {
      border-color: darken($button-color-primary-light, 7%);
      color: darken($button-color-primary-light, 7%);
    }

    &[disabled] {
      &:hover {
        color: $button-color-primary-light;
        border: $button-border-width-thick solid $button-color-primary-light;
      }
    }
  }

  // Secondary buttons
  &--secondary#{&}--solid,
  &--secondary#{&}--hollow {

    // States
    &:focus {
      box-shadow:
       0 0 0 $button-border-width-thick $background-light,
       0 0 0 ($button-border-width-thin * 2.5) $button-color-secondary-light;
    }

    // Contexts
    .background--dark & {
      &:focus {
        box-shadow:
         0 0 0 $button-border-width-thick $background-dark,
         0 0 0 ($button-border-width-thin * 2.5) $button-color-secondary-light;
      }
    }
  }

  &--secondary#{&}--solid {
    background-color: $button-color-secondary-light;

    // States
    &:hover {
      background-color: lighten($button-color-secondary-light, 7%);
    }

    &:active {
      background-color: darken($button-color-secondary-light, 7%);
    }

    &[disabled] {
      &:hover {
        background-color: $button-color-secondary-light !important;
      }
    }

    // Contexts
    .background--dark & {
      background-color: $button-color-secondary-dark;

      // States
      &:hover {
        background-color: lighten($button-color-secondary-dark, 7%);
      }

      &:active {
        background-color: darken($button-color-secondary-dark, 7%);
      }

      &[disabled] {
        &:hover {
          background-color: $button-color-secondary-light !important;
          opacity: 0.2 !important;
        }
      }
    }
  }

  &--secondary#{&}--hollow {
    color: $button-color-secondary-light;
    border: $button-border-width-thick solid $button-color-secondary-light;

    // States
    &:hover {
      border-color: lighten($button-color-secondary-light, 7%);
      color: lighten($button-color-secondary-light, 7%);
    }

    &:active {
      border-color: darken($button-color-secondary-light, 7%);
      color: darken($button-color-secondary-light, 7%);
    }

    &[disabled] {
      &:hover {
        color: $button-color-secondary-light;
        border: $button-border-width-thick solid $button-color-secondary-light;
      }
    }

    // Contexts
    .background--dark & {
      color: $button-color-secondary-dark;
      border: $button-border-width-thick solid $button-color-secondary-dark;

      // States
      &:hover {
        border-color: lighten($button-color-secondary-light, 14%);
        color: lighten($button-color-secondary-light, 14%);
      }

      &:active {
        border-color: darken($button-color-secondary-light, 14%);
        color: darken($button-color-secondary-light, 14%);
      }

      &[disabled] {
        &:hover {
          color: $button-color-secondary-dark;
          border: $button-border-width-thick solid $button-color-secondary-dark;
        }
      }
    }
  }

  // Tertiary buttons
  &--tertiary#{&}--solid,
  &--tertiary#{&}--hollow {

    // States
    &:focus {
      box-shadow:
       0 0 0 $button-border-width-thick $background-light,
       0 0 0 ($button-border-width-thin * 2.5) $button-color-tertiary-light;
    }

    // Contexts
    .background--dark & {
      &:focus {
        box-shadow:
         0 0 0 $button-border-width-thick $background-dark,
         0 0 0 ($button-border-width-thin * 2.5) $button-color-tertiary-light;
      }
    }
  }

  &--tertiary#{&}--solid {
    background-color: $button-color-tertiary-light;

    // States
    &:hover {
      background-color: lighten($button-color-tertiary-light, 7%);
    }

    &:active {
      background-color: darken($button-color-tertiary-light, 7%);
    }

    &[disabled] {
      &:hover {
        background-color: $button-color-tertiary-light !important;
      }
    }

    // Contexts
    .background--dark & {
      background-color: $button-color-tertiary-dark;

      // States
      &:hover {
        background-color: lighten($button-color-tertiary-dark, 7%);
      }

      &:active {
        background-color: darken($button-color-tertiary-dark, 7%);
      }

      &[disabled] {
        &:hover {
          background-color: $button-color-tertiary-dark !important;
        }
      }
    }
  }

  &--tertiary#{&}--hollow {
    color: $button-color-tertiary-light;
    border: $button-border-width-thick solid $button-color-tertiary-light;

    // States
    &:hover {
      border-color: lighten($button-color-tertiary-light, 7%);
      color: lighten($button-color-tertiary-light, 7%);
    }

    &:active {
      border-color: darken($button-color-tertiary-light, 7%);
      color: darken($button-color-tertiary-light, 7%);
      transform: $button-bounce;
      transition: none;
    }

    &[disabled] {
      &:hover {
        color: $button-color-tertiary-light;
        border: $button-border-width-thick solid $button-color-tertiary-light;
      }
    }

    // Contexts
    .background--dark & {
      color: $button-color-tertiary-dark;
      border: $button-border-width-thick solid $button-color-tertiary-dark;

      // States
      &:hover {
        border-color: lighten($button-color-tertiary-light, 21%);
        color: lighten($button-color-tertiary-light, 21%);
      }

      &:active {
        border-color: darken($button-color-tertiary-light, 21%);
        color: darken($button-color-tertiary-light, 21%);
      }

      &[disabled] {
        &:hover {
          color: $button-color-tertiary-dark;
          border: $button-border-width-thick solid $button-color-tertiary-dark;
        }
      }
    }
  }

  ///////////
  // SIZES //
  ///////////
  &--small {
    min-width: 6rem;
    border-radius: 0.5rem;
    font-size: 0.8em;
    min-height: 2rem;
  }

  &--small#{&}--hollow {
    border-width: $button-border-width-thin;

    // Contexts
    .background--dark & {
      border-width: $button-border-width-thin;
    }
  }

  &--small#{&}--icon {
    [class^="icon-"] {
      height: 0.8rem;
      margin-right: 0.2rem;
      position: relative;
       top: 0.125rem;
      width: 0.8rem;
    }
  }

  &--medium {
    min-width: 8rem;
    border-radius: 0.75rem;
    min-height: 2.5rem;
  }

  &--medium#{&}--icon {
    [class^="icon-"] {
      height: 1rem;
      margin-right: 0.3rem;
      position: relative;
       top: 0.125rem;
      width: 1rem;
    }
  }

  &--large {
    min-width: 10rem;
    border-radius: 0.75rem;
    font-size: 1.2em;
    letter-spacing: 1px;
    min-height: 3rem;
  }

  &--large#{&}--icon {
    [class^="icon-"] {
      height: 1.1rem;
      margin-right: 0.35rem;
      position: relative;
       top: 0.1875rem;
      width: 1.1rem;
    }
  }

  ///////////
  // FILLS //
  ///////////
  &--solid,
  &--hollow {

    // States
    &[disabled] {
      &:active {
        transform: none !important;
      }
    }
  }
}




///////////////////////
// COMPONENT STYLING //
///////////////////////
.action-row {

  // Media Queries
  @media (min-width: $bp-lap) {
    display: flex;
    flex-direction: row-reverse;
  }

  .button {

    // Makes the rightmost button flush with its container. First is last when the direction has been reversed.
    &:first-of-type {
      margin-right: 0;
    }
  }
}








/////////////////////
// PAGE FORMATTING //
/////////////////////
body {
  color: $type-dark;
  padding: 3rem;
  background-color: $background-light;
}

.background {
  transition: background-color $button-transition-duration ease;

  &--light {
    background-color: $background-light;
  }

  &--dark {
    background-color: $background-dark;
  }
}

h1,
h2,
h3 {
  margin: 0;
  padding: 0;

  // Contexts
  .background--dark & {
    color: $type-light;
  }
}

h1 {
  font-size: 1.5em;
  font-weight: 600;
}

h2 {
  font-size: 1em;
  font-weight: 400;
}

h3 {
  font-size: 0.9em;
  font-weight: 400;
  letter-spacing: 1px;
  margin-top: 2.5em;
  text-transform: uppercase;
}

hr {
  border: 1px solid $type-dark;
  margin-top: 2.5rem;

  // Contexts
  .background--dark & {
    border: 1px solid $type-light;
  }
}

// SVG Icons
// This controls the default behavior of how icons look when they're declared via the `<use>` tag
[class^="icon-"],
[class*=" icon-"] {
  display: inline-block;
  width: 1em;
  height: 1em;
  stroke-width: 0;
  stroke: currentColor;
  fill: currentColor;
}

.toggle {
  background-color: $background-dark;
  border: $button-border-width-thin solid $background-light;
  color: $type-light;
  font-size: 0.8em;
  outline: none;
  position: fixed;
   right: 0.625rem;
   top: 0.625rem;
  text-align: center;
  height: 4rem;
  width: 4rem;
  border-radius: 2rem;
  z-index: 100;

  &:hover {
    background-color: darken($background-dark, 10%);
  }

  &:focus {
    box-shadow:
     0 0 0 $button-border-width-thin $background-light,
     0 0 0 ($button-border-width-thick * 1.25) $background-dark;
  }

  &:active {
    background-color: darken($background-dark, 30%);
    transform: $button-bounce;
  }

  // Contexts
  .background--dark & {
    color: $background-dark;
    background-color: $background-light;
    border: $button-border-width-thin solid $background-dark;

    &:hover {
      background-color: desaturate(darken($background-light, 10%), 100%);
    }

    &:focus {
      box-shadow:
       0 0 0 $button-border-width-thin $background-dark,
       0 0 0 ($button-border-width-thick * 1.25) $background-light;
    }

    &:active {
      background-color: desaturate(darken($background-light, 30%), 100%);
      transform: $button-bounce;
    }
  }
}




///////////////
// JERK MODE //
///////////////
a[class*="button"],
div[class*="button"],
p[class*="button"],
span[class*="button"],
button[href],
input[type="button"][href] {

  &:before {
    box-shadow: 0px 3px 5px 0px rgba(0, 0, 0, 0.75);
    color: white;
    content: "Please use the correct button syntax!";
    background-color: fuchsia;
    font-size: 0.9rem;
    padding: 0.5rem 1rem;
    position: absolute;
     left: 0;
    transform: rotate(-4deg);
  }
}

              
            
!

JS

              
                  // Applies the class `.background` to `<body>` when the page loads
$(document).ready(function() {
  $('body').addClass('background');
});

// Toggles the background modifier class
$('#background-toggle').click(function() {
  $('body').toggleClass('background--light background--dark');
});

              
            
!
999px

Console