app/assets/stylesheets/framework/highlight.scss


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.file-content.code {
  border: 0;
  box-shadow: none;
  margin: 0;
  padding: 0;
  table-layout: fixed;

  pre {
    padding: 10px 0;
    border: 0;
    border-radius: 0 0 $border-radius-default;
    font-family: $monospace-font;
    font-size: $code-font-size;
    margin: 0;
    overflow: auto;
    overflow-y: hidden;
    white-space: pre;
    word-wrap: normal;
    border-left: 1px solid;

    code {
      display: inline-block;
      min-width: 100%;
      font-family: $monospace-font;
      white-space: normal;
      word-wrap: normal;
      padding: 0;

      .line {
        display: block;
        width: 100%;
        padding-left: 10px;
        padding-right: 10px;
        white-space: pre;

        &:empty::before {
          content: '\200b';
        }
      }
    }
  }

  .line-numbers {
    padding: 10px;
    text-align: right;
    float: left;
    border-bottom-left-radius: $border-radius-default;

    a {
      font-family: $monospace-font;
      white-space: nowrap;
      @include gl-display-flex;
      @include gl-justify-content-end;

      i,
      svg {
        float: left;
        margin-top: 3px;
        margin-right: 5px;
        visibility: hidden;
      }

      &:hover,
      &:focus {
        outline: none;

        i,
        svg {
          visibility: visible;
        }
      }
    }
  }

  pre .line,
  .line-numbers a {
    font-size: 0.8125rem;
    line-height: 1.1875rem;
    min-height: 1.1875rem;
  }
}

// Vertically aligns <table> line numbers (eg. blame view)
// see https://gitlab.com/gitlab-org/gitlab-foss/issues/54048
td.line-numbers {
  line-height: 1;
}

.project-highlight-puc .unicode-bidi::before {
  content: '\FFFD';
  cursor: pointer;
  text-decoration: underline wavy $red-500;
}

.blob-viewer {
  .line-numbers {
    min-width: 6rem;
    // for server-side-rendering
    .line-links {
      @include gl-display-flex;
    }

    // for client
    &.line-links {
      border-bottom-left-radius: 0;

      + pre {
        margin-left: 6rem;
      }
    }
  }

  .line-numbers:not(.line-links) a:hover::before,
  .line-numbers:not(.line-links) a:focus-within::before,
  .line-links:hover a::before,
  .line-links:focus-within a::before {
    @include gl-visibility-visible;
  }


  .file-line-num {
    @include gl-justify-content-end;
    @include gl-flex-grow-1;
    @include gl-pr-3;
  }

  .file-line-blame {
    @include gl-ml-3;
  }

  .file-line-num,
  .file-line-blame {
    @include gl-align-items-center;
    @include gl-display-flex;
  }
}