source/misc/embedded_libs/fmt-8.1.1/doc/bootstrap/mixins/center-block.less
browsing at commit = 0f4b0612f0b0a29d0133152faa1c8a6b56077e64
// Center-align a block level element
.center-block() {
display: block;
margin-left: auto;
margin-right: auto;
}