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How can I call a class in another class in css3?

I want to make an effect that will lead to the transition to my button when I visit the external div block (parent), which already has its own transition. Is it possible to do this with css or does it need some javascript?

My example:

.box {
	height: 300px;
	width: 300px;
	background: #eeeeee;	
	float: left;
	margin: 50px;
	-webkit-transition: All 0.5s ease;
	-moz-transition: All 0.5s ease;
	-o-transition: All 0.5s ease;
	-ms-transition: All 0.5s ease;
	transition: All 0.5s ease;
}
.box:hover {
	height: 350px;
}

#box_pic1 {
	background: url(http://nicholsd.com/_Media/image-15_med.png);
	background-repeat: no-repeat;
	background-position: relative;
	height: 196px;
	width: 262px;
	margin: 0 auto;
	margin-top: 20px;
}

.btn_ani {
	font-size: 13px;
	text-align: center;
	color: #ffffff;
	opacity: 0.5;
	width: 150px;
	background: #99745c;
	border:1px solid #99745c;
	line-height: 35px;
	transition: opacity 0.5s;
	-webkit-transition: all ease 0.5s;
	-moz-transition: all ease 0.5s;
	-o-transition: all ease 0.5s;
	-ms-transition: all ease 0.5s;
	transition: all ease 0.5s;		
	position: absolute;	
	margin-left: 56px;
}

.btn_ani:hover {
	background: #ffffff;
	color: #99745c;
    opacity: 1;
	-webkit-transition: all ease 0.7s;
	-moz-transition: all ease 0.7s;
	-o-transition: all ease 0.7s;
	-ms-transition: all ease 0.7s;
	transition: all ease 0.5s;	
	border:1px solid #99745c;
	margin-top: 80px;
}
<div class="box">				
	<a href="www.google.com">
		<div id="box_pic1">
			<div class="btn_ani">View</div>
		</div>
	</a>			
</div>
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2 answers

This can be done using CSS. You can simply transfer the state of :hoverthe parent .boxand the target object, for example .box:hover .btn_ani.

In this case, the elements may have their own meaning transition.

.box {
  height: 300px;
  width: 300px;
  background: #eeeeee;	
  float: left;
  margin: 50px;
  -webkit-transition: all 0.5s ease;
  -moz-transition: all 0.5s ease;
  -o-transition: all 0.5s ease;
  -ms-transition: all 0.5s ease;
  transition: all 0.5s ease;
}
.box:hover {
  height: 350px;
}

#box_pic1 {
  background: url(http://nicholsd.com/_Media/image-15_med.png);
  background-repeat: no-repeat;
  background-position: relative;
  height: 196px;
  width: 262px;
  margin: 0 auto;
  margin-top: 20px;
}

.btn_ani {
  font-size: 13px;
  text-align: center;
  color: #ffffff;
  opacity: 0.5;
  width: 150px;
  background: #99745c;
  border:1px solid #99745c;
  line-height: 35px;
  transition: opacity 0.5s;
  
  /* different transition from the parent */
  -webkit-transition: all ease 0.7s;
  -moz-transition: all ease 0.7s;
  -o-transition: all ease 0.7s;
  -ms-transition: all ease 0.7s;
  transition: all ease 0.7s;
  
  position: absolute;	
  margin-left: 56px;
}

.box:hover .btn_ani {
  background: #ffffff;
  color: #99745c;
  opacity: 1;	
  border:1px solid #99745c;
  margin-top: 80px;
}
<div class="box">				
  <a href="www.google.com">
    <div id="box_pic1">
      <div class="btn_ani">View</div>
    </div>
  </a>			
</div>
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If you want to try jQuery you can use a solution like this:

$('.box').hover(function(){
    $('.btn_ani').toggleClass('margin');
});

Using css:

.margin{
    margin-top:80px;
}

!

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