How to affect other elements when one element is hovered

Question

What I want to do is when a certain div is hovered, it'd affect the properties of another div.

For example, in this JSFiddle demo, when you hover over #cube it changes the background-color but what I want is that when I hover over #container, #cubeis affected.

div {   outline: 1px solid red; }  #container {   width: 200px;   height: 30px; }  #cube {   width: 30px;   height: 100%;   background-color: red; }  #cube:hover {   width: 30px;   height: 100%;   background-color: blue; }

<div id="container">   <div id="cube">   </div> </div>

Answer 1

If the cube is directly inside the container:

#container:hover > #cube { background-color: yellow; } 

If cube is next to (after containers closing tag) the container:

#container:hover + #cube { background-color: yellow; } 

If the cube is somewhere inside the container:

#container:hover #cube { background-color: yellow; } 

If the cube is a sibling of the container:

#container:hover ~ #cube { background-color: yellow; } 

Answer 2

In this particular example, you can use:

#container:hover #cube {     background-color: yellow;    } 

This example only works since cube is a child of container. For more complicated scenarios, you'd need to use different CSS, or use JavaScript.