Keyframes for all vendor prefixes using SCSS

keyframes.scss

/* Usage

@include keyframes(my-transition) {
    from {opacity: 0;}
    to {opacity: 1;}
}
*/

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