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use a child selector here to prevent double borders.\n  > .card-header + .list-group,\n  > .list-group + .card-footer {\n    border-top: 0;\n  }\n}\n\n.card-body {\n  // Enable `flex-grow: 1` for decks and groups so that card blocks take up\n  // as much space as possible, ensuring footers are aligned to the bottom.\n  flex: 1 1 auto;\n  // Workaround for the image size bug in IE\n  // See: https://github.com/twbs/bootstrap/pull/28855\n  min-height: 1px;\n  padding: $card-spacer-x;\n  color: $card...