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  Contributions do not include changes or additions to the Program that
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$close-text-shadow;\n  opacity: .5;\n\n  // Override <a>'s hover style\n  @include hover() {\n    color: $close-color;\n    text-decoration: none;\n  }\n\n  &:not(:disabled):not(.disabled) {\n    @include hover-focus() {\n      opacity: .75;\n    }\n  }\n}\n\n// Additional properties for button version\n// iOS requires the button element instead of an anchor tag.\n// If you want the anchor version, it requires `href=\"#\"`.\n// See https://developer.mozilla.org/en-US/docs/Web/Events/click#Safari_Mobile\n\n// styl...