elector('#firstSection > div');
const secondDiv = firstDiv.cloneNode(true);
const shadowHost = document.querySelector('#shadowHost');
const shadowRoot = shadowHost.attachShadow({mode: 'open'});
shadowRoot.appendChild(secondDiv);

const greenSpan = firstDiv.children[0];
const redSpan = firstDiv.children[1];
const blueSpan = firstDiv.children[2];
const whiteSpan = firstDiv.children[3];
const yellowSpan = firstDiv.children[4];
const greenShadowSpan = secondDiv.children[0];
const redShadowSpan = secondDiv.child