Remove div wen ember growl notification is hidden

We have div within ember growl notification after the notification hides with css animation after 5 sec ...on inspecting the div is still seen in the element. I want to remove this div element

  <div class="ember-growl-container">                              
     
            <div class="ember-growl-notification-item-container ember-view " data-test-flash-selector=>
                    
            <div class=" col-md-1 ">
                <button onclick= class="ember-close">X</button>
            </div>
            </div>
    
</div>

CSS Class

.ember-success {
color: #155724;
background-color: #d4edda;
border-color: #c3e6cb;
box-shadow: 1px 1px 1px 1px;
opacity: 1;
border: 1px solid transparent;
background-image: none;
font-family: unset;
text-align: left;
font-weight: 700;
top: 10%;
box-sizing: border-box;
z-index: 5000;
padding: 9px;
display: inherit;
border-radius: 4px;
-webkit-animation: cssAnimation 0s ease-in 5s forwards;
-moz-animation: cssAnimation 0s ease-in 5s forwards;
-o-animation: cssAnimation 0s ease-in 5s forwards;
animation: cssAnimation 0s ease-in 5s forwards;
-webkit-animation-fill-mode: forwards;
animation-fill-mode: forwards;
.ember-close {
    border: none;
    background-color: #d4edda;
    color: #155724;
}

}