vscode keyframes报错怎么办

@keyframes shake-data-v-e732b878 {

            0% {

                -webkit-transform-origin: bottom;

                transform-origin: bottom;

                -webkit-transform: rotate(0deg);

                transform: rotate(0deg);

            }

            25% {

                -webkit-transform-origin: bottom;

                transform-origin: bottom;

                -webkit-transform: rotate(24deg);

                transform: rotate(24deg);

            }

            50% {

                -webkit-transform-origin: bottom;

                transform-origin: bottom;

                -webkit-transform: rotate(0deg);

                transform: rotate(0deg);

            }

            75% {

                -webkit-transform-origin: bottom;

                transform-origin: bottom;

                -webkit-transform: rotate(-24deg);

                transform: rotate(-24deg);

            }

            to {

                -webkit-transform-origin: bottom;

                transform-origin: bottom;

                -webkit-transform: rotate(0deg);

                transform: rotate(0deg);

            }

        }

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错误    CS0103    当前上下文中不存在名称“keyframes”    H5.Web.Site    D:\mywork_2.0\shesuites2\h5-suandao.site\4.Site\H5.Web.Site\Views\SuanDaoHome\GuanGongQian.cshtml    255    活动