For example you have this structure
<div id="dr-wordpress">
<h1 id="web" > This is my Blog </h1>
</div>
If the web is directly inside the "dr-wordpress":
#dr-wordpress:hover > #web { background-color: yellow; }
If web is next to (after containers closing tag) the "dr-wordpress":
#dr-wordpress:hover + #web { background-color: yellow; }
If the web is somewhere inside the "dr-wordpress":
#dr-wordpress:hover #web { background-color: yellow; }
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