source/misc/embedded_libs/fmt-8.1.1/doc/bootstrap/mixins/background-variant.less
browsing at commit = c253d62019e402b6da7066a52f6dcd0b9ced8cbe
// Contextual backgrounds
.bg-variant(@color) {
background-color: @color;
a&:hover {
background-color: darken(@color, 10%);
}
}