:host { height: 54px; font-size: 1.3rem; background-color: steelblue; color: white; } polyfill-next-selector { content: ':host > *'; } ::content > * { margin: 8px; } :host { display: inline-block; height: 200px; width: calc({{ 100 / g.columns }}% - 16px); font-size: 50px; background: gray; margin: 8px; }