reduce div nesting in instances

Signed-off-by: Arthur Lu <learthurgo@gmail.com>

scripts/index.js

@@ -198,9 +198,9 @@ async function handleInstanceAdd () {
 export class Instance {
 	constructor () {
 		let shadowRoot = document.createElement("div");
+		shadowRoot.classList.add("w3-row");
 
 		shadowRoot.innerHTML = `
-			<div class="w3-row">
 			<div class="w3-col l1 m2 s6">
 				<p id="instance-id"></p>
 			</div>
@@ -227,7 +227,6 @@ export class Instance {
 				<img id="configure-btn" class="clickable">
 				<img id="delete-btn" class="clickable">
 			</div>
-			</div>
 		`;
 
 		this.shadowElement = shadowRoot;