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$size: 100px $color: #088 $duration: 1000ms //in ms @keyframes loadingAnimation 0% border-width: 0 width: 0 height: 0 margin: 0 opacity: 0.1 50% border-width: round($size / 10) opacity: 0.8 100% border-width: 0 width: $size height: $size margin: round($size / -2) opacity: 0.1 .loading &:before, &:after content: '' .loading, .loading:before, .loading:after display: block position: fixed top: 50% left: 50% box-sizing: border-box border: radius: 50% width: 0 color: $color style: solid animation: name: loadingAnimation duration: $duration iteration-count: infinite .loading:before animation-delay: round($duration / 3) .loading:after animation-delay: round($duration / 3) * 2
Also see: Tab Triggers