// 动画效果：渐隐
.fade-enter-active, .fade-leave-active {
  transition: opacity .5s;
}
.fade-enter, .fade-leave-to{
  opacity: 0 !important;
}
// 动画效果：上下+渐隐
.slide-fade-enter-active, .slide-fade-leave-active {
  transition: opacity .3s, transform .5s;
}
.slide-fade-enter, .slide-fade-leave-to{
  opacity: 0;
}
.slide-fade-enter, .slide-fade-leave-to {
  transform: translateY(-50%);
}
.slide-fade-enter-to, .slide-fade-leave {
  transform: translateY(0);
}
.collapse-transition {
  transition: 0.3s height ease-in-out, 0.3s padding-top ease-in-out, 0.3s padding-bottom ease-in-out;
}