diff --git a/electron-preload/index.ts b/electron-preload/index.ts
new file mode 100644
index 0000000..d8e51b4
--- /dev/null
+++ b/electron-preload/index.ts
@@ -0,0 +1,19 @@
+import { useLoading } from './loading'
+
+function domReady(condition: DocumentReadyState[] = ['complete', 'interactive']) {
+  return new Promise(resolve => {
+    if (condition.includes(document.readyState)) {
+      resolve(true)
+    } else {
+      document.addEventListener('readystatechange', () => {
+        if (condition.includes(document.readyState)) {
+          resolve(true)
+        }
+      })
+    }
+  })
+}
+
+const { appendLoading, removeLoading } = useLoading()
+window.removeLoading = removeLoading
+domReady().then(appendLoading)
diff --git a/electron-preload/loading.ts b/electron-preload/loading.ts
new file mode 100644
index 0000000..9d9351e
--- /dev/null
+++ b/electron-preload/loading.ts
@@ -0,0 +1,67 @@
+/**
+ * https://tobiasahlin.com/spinkit
+ * https://connoratherton.com/loaders
+ * https://projects.lukehaas.me/css-loaders
+ * https://matejkustec.github.io/SpinThatShit
+ */
+ export function useLoading() {
+  const className = `loaders-css__square-spin`
+  const styleContent = `
+@keyframes square-spin {
+  25% { transform: perspective(100px) rotateX(180deg) rotateY(0); }
+  50% { transform: perspective(100px) rotateX(180deg) rotateY(180deg); }
+  75% { transform: perspective(100px) rotateX(0) rotateY(180deg); }
+  100% { transform: perspective(100px) rotateX(0) rotateY(0); }
+}
+.${className} > div {
+  animation-fill-mode: both;
+  width: 50px;
+  height: 50px;
+  background: #fff;
+  animation: square-spin 3s 0s cubic-bezier(0.09, 0.57, 0.49, 0.9) infinite;
+}
+.app-loading-wrap {
+  position: fixed;
+  top: 0;
+  left: 0;
+  width: 100vw;
+  height: 100vh;
+  display: flex;
+  align-items: center;
+  justify-content: center;
+  background: #282c34;
+  z-index: 9;
+}
+    `
+  const oStyle = document.createElement('style')
+  const oDiv = document.createElement('div')
+
+  oStyle.id = 'app-loading-style'
+  oStyle.innerHTML = styleContent
+  oDiv.className = 'app-loading-wrap'
+  oDiv.innerHTML = `<div class="${className}"><div></div></div>`
+
+  return {
+    appendLoading() {
+      safe.append(document.head, oStyle)
+      safe.append(document.body, oDiv)
+    },
+    removeLoading() {
+      safe.remove(document.head, oStyle)
+      safe.remove(document.body, oDiv)
+    },
+  }
+}
+
+const safe = {
+  append(parent: HTMLElement, child: HTMLElement) {
+    if (!Array.from(parent.children).find(e => e === child)) {
+      return parent.appendChild(child)
+    }
+  },
+  remove(parent: HTMLElement, child: HTMLElement) {
+    if (Array.from(parent.children).find(e => e === child)) {
+      return parent.removeChild(child)
+    }
+  },
+}