css hover changes the style of child elements and other elements
+ indicates the next level element, > indicates child elements
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title></title>
</head>
<style>
#a {color : #FFFF00;}
#a:hover + #c{color : #00FF00;}
#a:hover + #c > #b{color : #0000FF;}
</style>
<div id='a'>元素1
</div>
<div id='c'>元素3
<div id='b'>元素2</div>
</div>
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