Refactoring: move all code files into a src directory

src/UI/Base/CenterFlexedElement.ts

@@ -0,0 +1,32 @@
+import BaseUIElement from "../BaseUIElement"
+
+export class CenterFlexedElement extends BaseUIElement {
+    private _html: string
+
+    constructor(html: string) {
+        super()
+        this._html = html ?? ""
+    }
+
+    InnerRender(): string {
+        return this._html
+    }
+
+    AsMarkdown(): string {
+        return this._html
+    }
+
+    protected InnerConstructElement(): HTMLElement {
+        const e = document.createElement("div")
+        e.innerHTML = this._html
+        e.style.display = "flex"
+        e.style.height = "100%"
+        e.style.width = "100%"
+        e.style.flexDirection = "column"
+        e.style.flexWrap = "nowrap"
+        e.style.alignContent = "center"
+        e.style.justifyContent = "center"
+        e.style.alignItems = "center"
+        return e
+    }
+}