小编Eli*_*xan的帖子

好的,所以我不明白为什么这不会缓和,只有:(快速查看,只需将其粘贴到http://htmledit.squarefree.com,例如)

<style>
#over {
background: url(http://th01.deviantart.net/fs71/150/f/2013/005/0/6/dal_shabet__have__don_t_have_by_awesmatasticaly_cool-d5qkzu8.jpg);
height:150px;
width:150px;
}

#in {
background: url(http://www.mygrafico.com/images/uploads/thumbs/thumb_revidevi_CoolMonsterTruck.jpg);
height:150px;
width:150px;
}

#in:hover {
opacity: 0;
transition: opacity .3s ease-in-out;
}

</style>

<div id="over">
<div id="in"></div
</div>