或者解答一下，scss怎么編譯成下面這段css

@-webkit-keyframes 'slideLeft' {
?????????? ??? ?0% { left: -500px; }
?????????? ??? ?100% { left: 0; }
??????????? }
??????????? @-moz-keyframes 'slideLeft' {
?????????? ??? ?0% { left: -500px; }
?????????? ??? ?100% { left: 0; }
??????????? }
??????????? @-o-keyframes 'slideLeft' {
?????????? ??? ?0% { left: -500px; }
?????????? ??? ?100% { left: 0; }
??????????? }
??????????? @-ms-keyframes 'slideLeft' {
?????????? ??? ?0% { left: -500px; }
?????????? ??? ?100% { left: 0; }
??????????? }
??????????? @keyframes 'slideLeft' {
?????????? ??? ?0% { left: -500px; }
?????????? ??? ?100% { left: 0; }
??????????? }