Variable Styling

Looking at options to dynamically control the styling.

Option 1.  Bind an attribute of an element to an attribute of the div.

<paper-toggle-button class="blue" checked="{{fadeSelected}}">

Then create a css rule that changes based on the value.
*[data-fade-selected="true"] {
  opacity: 0.3;
}

Option 2.  Call a function that changes a style attribute

For elements with change events, you can call a function on-change. In the function, you locate the id or class and then change the style.

$['drawerPanel'].style.display = 'none';