Blame content/assets/css/bootstrap/_close.scss

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//
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// Close icons
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// --------------------------------------------------
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.close {
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  float: right;
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  font-size: ($font-size-base * 1.5);
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  font-weight: $close-font-weight;
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  line-height: 1;
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  color: $close-color;
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  text-shadow: $close-text-shadow;
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  @include opacity(.2);
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  &:hover,
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  &:focus {
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    color: $close-color;
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    text-decoration: none;
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    cursor: pointer;
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    @include opacity(.5);
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  }
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  // [converter] extracted button& to button.close
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}
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// Additional properties for button version
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// iOS requires the button element instead of an anchor tag.
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// If you want the anchor version, it requires `href="#"`.
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button.close {
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  padding: 0;
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  cursor: pointer;
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  background: transparent;
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  border: 0;
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  -webkit-appearance: none;
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}