/* 效果一：彩带 */
.card-info>.is-center:hover {
  background: url(https://gcore.jsdelivr.net/gh/rigodlee/BLOGCDN/img/H3342af90d24b4d62b9bbfec9688ccc25M.gif);
}

/* 效果二：花 */
/* .card-info>.is-center:hover {
  background: url(https://gcore.jsdelivr.net/gh/rigodlee/BLOGCDN/img/20200530181856.gif);
}
*/