請問下，怎么讓使用bootstrap框架的窗口分辨大小改變的時候,消失的組件有淡入淡出的效果呢？舉個例子。<div?class="container"> ????<div?class="row"> ????????<div?class="col-md-9"> ??????????<div?class="jumbotron?hidden-sm?hidden-xs?"> ????????<h1?class="display-3">Hello,?world!</h1> ????????<p?class="lead">This?is?a?simple?hero?unit,?a?simple?jumbotron-style?component?for?calling?extra?attention?to?featured?content?or?information.</p> ????????</div> ????????</div> ????????<div?class="col-md-3"> ??????????<div?class="list-group"> <a?href="#"?class="list-group-item?active">Dapibus?ac?facilisis?in</a> <a?href="#"?class="list-group-item?">Dapibus?ac?facilisis?in</a> <a?href="#"?class="list-group-item?">Dapibus?ac?facilisis?in</a> <a?href="#"?class="list-group-item?">Dapibus?ac?facilisis?in</a> <a?href="#"?class="list-group-item?">Dapibus?ac?facilisis?in</a> <a?href="#"?class="list-group-item?">Dapibus?ac?facilisis?in</a> ????</div> ????????</div> ????</div> </div>我想讓其中的jumbotron 這個元素，在分辨縮小的時候消失，請問怎么再消失的時候添加淡入淡出的效果？?；蛘呤怯惺裁雌渌膭e的實現方法么？