How to set :host {} based on media query in Polymer? -

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i have set height on :root element, or else not viewport size want scrollbar. however, want set height: calc(100% - 130px); when viewport less 900px.

how can since can not use @media query? tried no success:

<template>     <style include="iron-flex iron-flex-alignment">      :host[show] {        background-color: var(--pink-color);        width: 100%;        overflow-x: hidden;        overflow-y: auto;        outline: none;        display: flex;      }       :host[smallscreen] {        height: calc(100% - 130px);      }      <div hidden$="{{!show}}">       <iron-media-query query="(max-width: 899px)"          query-matches="{{smallscreen}}"></iron-media-query> ...  <script>     polymer({       is: 'video-selection',       properties: {         show: {           type: boolean,           value: true,           reflecttoattribute: true         },         smallscreen: {           type: boolean,           value: false,           reflecttoattribute: true         }       },

i think need

 :host([small-screen]) {    height: calc(100% - 130px);  }

jsbin example


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