javascript change style of dom code example
Example 1: javascript css
document.getElementById(id).style.property = new style
Example 2: how to change an element in a different elements code css
/*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; }