instead of repeating all those values you could just separate the selectors by comma

```
@-webkit-keyframes sf-blink,
@-moz-keyframes sf-blink,
@-o-keyframes sf-blink,
@keyframes sf-blink {
    0% { color: black; }
    50% { color: #bbb; }
    100% { color: black; }
}
```