hacks-guide-minimal-mistakes-theme/_sass/minimal-mistakes/_utilities.scss

/* ==========================================================================
   UTILITY CLASSES
   ========================================================================== */

/*
   Visibility
   ========================================================================== */

/* http://www.456bereastreet.com/archive/200711/screen_readers_sometimes_ignore_displaynone/ */

.hidden,
.is--hidden {
  display: none;
  visibility: hidden;
}

/* for preloading images */

.load {
  display: none;
}

.transparent {
  opacity: 0;
}

/* https://developer.yahoo.com/blogs/ydn/clip-hidden-content-better-accessibility-53456.html */

.visually-hidden,
.screen-reader-text,
.screen-reader-text span,
.screen-reader-shortcut {
  position: absolute !important;
  clip: rect(1px, 1px, 1px, 1px);
  height: 1px !important;
  width: 1px !important;
  border: 0 !important;
  overflow: hidden;
}

body:hover .visually-hidden a,
body:hover .visually-hidden input,
body:hover .visually-hidden button {
  display: none !important;
}

/* screen readers */

.screen-reader-text:focus,
.screen-reader-shortcut:focus {
  clip: auto !important;
  height: auto !important;
  width: auto !important;
  display: block;
  font-size: 1em;
  font-weight: bold;
  padding: 15px 23px 14px;
  background: #fff;
  z-index: 100000;
  text-decoration: none;
  box-shadow: 0 0 2px 2px rgba(0, 0, 0, 0.6);
}

/*
   Skip links
   ========================================================================== */

.skip-link {
  position: fixed;
  z-index: 20;
  margin: 0;
  font-family: $sans-serif;
  white-space: nowrap;
}

.skip-link li {
  height: 0;
  width: 0;
  list-style: none;
}

/*
   Type
   ========================================================================== */

.text-left {
  text-align: left;
}

.text-center {
  text-align: center;
}

.text-right {
  text-align: right;
}

.text-justify {
  text-align: justify;
}

.text-nowrap {
  white-space: nowrap;
}

/*
   Alignment
   ========================================================================== */

/* clearfix */

.cf {
  clear: both;
}

.wrapper {
  margin-left: auto;
  margin-right: auto;
  width: 100%;
}

/*
   Images
   ========================================================================== */

/* image align left */

.align-left {
  display: block;
  margin-left: auto;
  margin-right: auto;

  @include breakpoint($small) {
    float: left;
    margin-right: 1em;
  }
}

/* image align right */

.align-right {
  display: block;
  margin-left: auto;
  margin-right: auto;

  @include breakpoint($small) {
    float: right;
    margin-left: 1em;
  }
}

/* image align center */

.align-center {
  display: block;
  margin-left: auto;
  margin-right: auto;
}

/* file page content container */

.full {
  @include breakpoint($large) {
    margin-right: -1 * span(2.5 of 12) !important;
  }
}

/*
   Icons
   ========================================================================== */

.icon {
  display: inline-block;
  fill: currentColor;
  width: 1em;
  height: 1.1em;
  line-height: 1;
  position: relative;
  top: -0.1em;
  vertical-align: middle;
}

/* social icons*/

.social-icons {
  .fa {
    color: $text-color;
  }

  .fa-behance,
  .fa-behance-square {
    color: $behance-color;
  }

  .fa-bitbucket,
  .fa-bitbucket-square {
    color: $bitbucket-color;
  }

  .fa-dribbble {
    color: $dribbble-color;
  }

  .fa-facebook,
  .fa-facebook-square {
    color: $facebook-color;
  }

  .fa-flickr {
    color: $flickr-color;
  }

  .fa-foursquare {
    color: $foursquare-color;
  }

  .fa-github,
  .fa-github-alt,
  .fa-github-square {
    color: $github-color;
  }

  .fa-google-plus,
  .fa-google-plus-square {
    color: $google-plus-color;
  }

  .fa-instagram {
    color: $instagram-color;
  }

  .fa-lastfm,
  .fa-lastfm-square {
    color: $lastfm-color;
  }

  .fa-linkedin,
  .fa-linkedin-square {
    color: $linkedin-color;
  }

  .fa-pinterest,
  .fa-pinterest-p,
  .fa-pinterest-square {
    color: $pinterest-color;
  }

  .fa-rss,
  .fa-rss-square {
    color: $rss-color;
  }

  .fa-soundcloud {
    color: $soundcloud-color;
  }

  .fa-stack-exchange,
  .fa-stack-overflow {
    color: $stackoverflow-color;
  }

  .fa-tumblr,
  .fa-tumblr-square {
    color: $tumblr-color;
  }

  .fa-twitter,
  .fa-twitter-square {
    color: $twitter-color;
  }

  .fa-vimeo,
  .fa-vimeo-square {
    color: $vimeo-color;
  }

  .fa-vine {
    color: $vine-color;
  }

  .fa-youtube,
  .fa-youtube-square,
  .fa-youtube-play {
    color: $youtube-color;
  }

  .fa-xing,
  .fa-xing-square {
    color: $xing-color;
  }
}

/*
   Navicons
   ========================================================================== */

.navicon {
  position: relative;
  width: $navicon-width;
  height: $navicon-height;
  background: #fff;
  margin: auto;
  -webkit-transition: 0.3s;
  transition: 0.3s;

  &:before,
  &:after {
    content: "";
    position: absolute;
    left: 0;
    width: $navicon-width;
    height: $navicon-height;
    background: #fff;
    -webkit-transition: 0.3s;
    transition: 0.3s;
  }

  &:before {
    top: (-2 * $navicon-height);
  }

  &:after {
    bottom: (-2 * $navicon-height);
  }
}

.close .navicon {
  /* hide the middle line*/
  background: transparent;

  /* overlay the lines by setting both their top values to 0*/
  &:before,
  &:after {
    -webkit-transform-origin: 50% 50%;
    -ms-transform-origin: 50% 50%;
    transform-origin: 50% 50%;
    top: 0;
    width: $navicon-width;
  }

  /* rotate the lines to form the x shape*/
  &:before {
    -webkit-transform: rotate3d(0, 0, 1, 45deg);
    transform: rotate3d(0, 0, 1, 45deg);
  }
  &:after {
    -webkit-transform: rotate3d(0, 0, 1, -45deg);
    transform: rotate3d(0, 0, 1, -45deg);
  }
}

/*
   Sticky, fixed to top content
   ========================================================================== */

.sticky {
  @include breakpoint($large) {
    @include clearfix();
    position: -webkit-sticky;
    position: sticky;
    top: 2em;

    > * {
      display: block;
    }
  }
}

/*
   Wells
   ========================================================================== */

.well {
  min-height: 20px;
  padding: 19px;
  margin-bottom: 20px;
  background-color: #f5f5f5;
  border: 1px solid #e3e3e3;
  border-radius: $border-radius;
  box-shadow: inset 0 1px 1px rgba(0, 0, 0, 0.05);
}

/*
   Modals
   ========================================================================== */

.show-modal {
  overflow: hidden;
  position: relative;

  &:before {
    position: absolute;
    content: "";
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: 999;
    background-color: rgba(255, 255, 255, 0.85);
  }

  .modal {
    display: block;
  }
}

.modal {
  display: none;
  position: fixed;
  width: 300px;
  top: 50%;
  left: 50%;
  margin-left: -150px;
  margin-top: -150px;
  min-height: 0;
  z-index: 9999;
  background: #fff;
  border: 1px solid $border-color;
  border-radius: $border-radius;
  box-shadow: $box-shadow;

  &__title {
    margin: 0;
    padding: 0.5em 1em;
  }

  &__supporting-text {
    padding: 0 1em 0.5em 1em;
  }

  &__actions {
    padding: 0.5em 1em;
    border-top: 1px solid $border-color;
  }
}

/*
   Footnotes
   ========================================================================== */

.footnote {
  color: mix(#fff, $gray, 25%);
  text-decoration: none;
}

.footnotes {
  color: mix(#fff, $gray, 25%);

  ol,
  li,
  p {
    margin-bottom: 0;
    font-size: $type-size-6;
  }
}

a.reversefootnote {
  color: $gray;
  text-decoration: none;

  &:hover {
    text-decoration: underline;
  }
}

/*
   Required
   ========================================================================== */

.required {
  color: $danger-color;
  font-weight: bold;
}

/*
   Google Custom Search Engine
   ========================================================================== */

.gsc-control-cse {
  table,
  tr,
  td {
    border: 0; /* remove table borders widget */
  }
}

/*
   Responsive Video Embed
   ========================================================================== */

.responsive-video-container {
  position: relative;
  margin-bottom: 1em;
  padding-bottom: 56.25%;
  height: 0;
  overflow: hidden;
  max-width: 100%;

  iframe,
  object,
  embed {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
  }
}

// full screen video fixes
:-webkit-full-screen-ancestor {
  .masthead,
  .page__footer {
    position: static;
  }
}