remove styling on destroy

packages/core/src/utils/injectCSS.ts

@@ -1,15 +1,13 @@
 export default function injectCSS(css: string) {
-  if (process.env.NODE_ENV !== 'test') {
-    const style = document.createElement('style')
-    style.type = 'text/css'
-    style.textContent = css
-    const { head } = document
-    const { firstChild } = head
+  const style = document.createElement('style')
+  style.type = 'text/css'
+  style.textContent = css
+  const { head } = document
+  const { firstChild } = head
 
-    if (firstChild) {
-      head.insertBefore(style, firstChild)
-    } else {
-      head.appendChild(style)
-    }
+  if (firstChild) {
+    return head.insertBefore(style, firstChild)
+  } else {
+    return head.appendChild(style)
   }
 }

packages/core/src/utils/removeElement.ts

@@ -0,0 +1,5 @@
+export default function removeElement(element: HTMLElement) {
+  if (element && element.parentNode) {
+    element.parentNode.removeChild(element)
+  }
+}