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<style type="text/css">
.box:hover>.tt {
opacity: 1
}
.box{
position: relative;
}
.box:hover>.tt {
opacity: 1
}
.hoverchange {
width: 100px;
height: 100px;
background-color:brown;
}
.tt {
position: absolute;
top: 0;
opacity: 0;
transition: opacity 2s;
background-color: red;
}
</style>
<div class="box">
<div class="hoverchange"></div>
<div class="hoverchange tt"></div>
</div>
<div class="box">
<div class="hoverchange"></div>
<div class="hoverchange tt"></div>
</div>
<div class="box">
<div class="hoverchange"></div>
<div class="hoverchange tt"></div>
</div>