onion/sass/mixins.scss

// keyframes mixin
@mixin keyframes($name) {
    @-webkit-keyframes #{$name} {
        @content; 
    }
    @-moz-keyframes #{$name} {
        @content;
    }
    @-ms-keyframes #{$name} {
        @content;
    }
    @keyframes #{$name} {
        @content;
    } 
}