discourse/app/assets/stylesheets/common/base/onebox.scss

a.loading-onebox {
  background: {
    image: image-url("spinner_96.gif");
    position: 0;
    size: 20px;
    height: 25px;
    repeat: no-repeat;
  };
  padding-left: 25px;
}


.onebox-result {
  @include post-aside;

  margin-top: 15px;
  padding: 12px 25px 12px 12px;
  font-size: 1em;
  > .source {
    margin-bottom: 12px;
    margin-right: 10px;
    display: block;
    color: $primary;
    position: relative;
    height: 20px;
    .info {
      a {
        color: black;
        text-decoration: none;
        padding-right: 10px;
      }
      position: absolute;
      font-size: 1em;
      img.favicon {
        margin-right: 3px;
      }
    }
  }


  .onebox-result-body {
    padding-top: 5px;
    img {
      max-height: 80%;
      max-width: 25%;
      height: auto;
      float: left;
      margin-right: 10px;
    }
    h3, h4 {
      margin: 0;
    }
    code {
      max-height: 400px;
    }
    .metrics {
      clear: both;
      padding-bottom: 25px;
      .metric {
        display: inline-block;
        padding-left: 33px;
        float: left;
      }
    }
  }
}

// RottenTomatoes Onebox
.onebox-result {
  .onebox-result-body {
    img.verdict {
      float: none;
      margin-right: 7px;
    }
    img.popcorn {
      float: none;
      margin-left: 20px;
      margin-right: 5px;
    }
  }
}

@mixin onebox-favicon($class, $image) {
  &.#{$class} .source {
    background: image-url("favicons/#{$image}.png") no-repeat;
    padding-left: 20px;
  }
}

aside.onebox {
  @include post-aside;

  padding: 12px 25px 12px 12px;
  font-size: 1em;

  header {
    a[href] {
      color: $primary;
      text-decoration: none;
    }
  }

  @include onebox-favicon('stackexchange', 'stackexchange');
  @include onebox-favicon('twitterstatus', 'twitter');
  @include onebox-favicon('wikipedia', 'wikipedia');
  @include onebox-favicon('githubblob', 'github');
  @include onebox-favicon('githubcommit', 'github');
  @include onebox-favicon('githubpullrequest', 'github');
  @include onebox-favicon('githubissue', 'github');
  @include onebox-favicon('githubgist', 'github');
  @include onebox-favicon('amazon', 'amazon');


  .onebox-body {
    clear: both;

    h3, h4 {
      font-size: 1.17em;
      margin: 10px 0;
    }

    a[href] {
      color: dark-light-choose(scale-color($tertiary, $lightness: -20%), $tertiary);
      text-decoration: none;
    }

    a[href]:visited {
      color: dark-light-choose(scale-color($tertiary, $lightness: -20%), $tertiary);
    }

    img {
      max-height: 80%;
      max-width: 20%;
      height: auto;
      float: left;
      margin-right: 10px;
    }
  }
}

aside.onebox .onebox-body .onebox-avatar {
  max-height: none;
  max-width: none;
  height: 90px;
  width: 90px;
}

blockquote {
  aside.onebox {
    @include post-aside;
  }
}

// -- Onebox Github Code Blob --
pre.onebox code ol.lines li:before {
  position: absolute;
  display:inline-block;
  width:35px;
  left: -40px;
  color:#AFAFAF;
  text-align:right;
  padding-right:5px;
  font-size:12px;
  line-height: 1.9em;
  content: counter(li-counter);
  counter-increment: li-counter;
}


pre.onebox code ol{
	margin-left:0px;
	line-height:1.5em;
}
pre.onebox code {
  background-color: dark-light-choose(#fff, #000);
}
pre.onebox code li{
	padding-left:5px;
}

pre.onebox code ol.lines{
	position:relative;
	margin-left: 40px;
}

pre.onebox code ol.lines li {
	list-style-type: none;
	padding-left: 5px;
	margin-left: 0px;
	border-left: 1px solid #CFCFCF;
	min-height: 1.5em; //show empty li lines
  white-space: pre;
}

pre.onebox code li.selected{
	background-color: dark-light-choose(#F8EEC7, #541);
}

pre.onebox code {
 white-space: normal;
}

//Onebox - Github - Pull request
.onebox-body .github-commit-status {
  background: #F5F5F5;
  border-radius: 5px;
  margin:0px 0px 5px 100px;
  padding: 10px;
}

.onebox-body .status_tag {
  display:inline-block;
  color:#fff;
  padding:1px 4px;
  border-radius:3px;
  font-weight:bold;
  margin-bottom:5px;
  text-transform:capitalize;
}

.onebox-body .build_status
{
  padding: 2px;
  font-size:12px;
}

.onebox-body .status_tag.open {
  background-color:#6cc644;
}
.onebox-body .status_tag.merged{
  background-color:#6e5494;
}
.onebox-body .status_tag.closed {
  background-color:#bd2c00;
}

.onebox-body .github-content-right{
  margin-left:100px;
}

//Onebox - Twitter - Status
aside.onebox.twitterstatus .onebox-body {
  h4 {
    margin-bottom: 0;
  }
}
.onebox.twitterstatus {
  .thumbnail {
    float: left;
  }
  p, .tweet {
    float: left;
    display: inline-block;
    white-space: pre-wrap;
    padding-top: 3px;
    width: 85%;
  }
  .date {
    clear: left;
    padding-top: 5px;
  }
}

// Onebox - Imgur - Album
.onebox.imgur-album {
  .outer-box {
    position: absolute;
    z-index: 935;
    width: 100%;
    height: 30px;
    overflow: hidden;
    font-size: 12px;
    color: #fff;
    background-color: rgba(0, 0, 0, 0.6);

    .inner-box {
      padding-left: 10px;
      padding-right: 10px;
      overflow: hidden;
      text-overflow: ellipsis;
      word-wrap: normal;
      white-space: nowrap;

      .album-title {
        width: 100%;
        font-size: 13px;
        line-height: 30px;
        color: #ccc;
        text-decoration: none;
      }
    }
  }
}

// resize stackexchange onebox image
aside.onebox.stackexchange .onebox-body img {
  max-height: 60%;
  max-width: 10%;
}