talos

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.fade {
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  @include transition($transition-fade);
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  &:not(.show) {
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    opacity: 0;
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  }
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}
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.collapse {
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  &:not(.show) {
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    display: none;
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  }
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}
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.collapsing {
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  position: relative;
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  height: 0;
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  overflow: hidden;
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  @include transition($transition-collapse);
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}
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