fix button themes and fontawesome icons

apps/remix-ide/src/app/plugins/solidity-umlgen.tsx

@@ -37,6 +37,11 @@ const themeCollection = [
 
 type ThemeQualityType = { name: string, quality: 'light' | 'dark', url: string }
 
+/**
+ * add context menu which will offer download as pdf and download png.
+ * add menu under the first download button to download
+ */
+
 export class SolidityUmlGen extends ViewPlugin implements ISolidityUmlGen {
   element: HTMLDivElement
   currentFile: string

libs/remix-ui/solidity-uml-gen/src/lib/solidity-uml-gen.tsx

@@ -111,14 +111,17 @@ export function RemixUiSolidityUmlGen ({ plugin, updatedSvg, loading, themeSelec
                   <div className="position-absolute bg-transparent rounded p-2" id="buttons"
                     style={{ zIndex: 3,  top: '10', right: '2em' }}
                   >
-                    <button className="btn btn-outline-success btn-sm rounded-circle mr-1" onClick={() => zoomIn()}>
+                    <button className="btn btn-outline-info btn-sm rounded-circle mr-1" onClick={() => resetTransform()}>
-                      <i className="fa fa-plus"></i>
+                      <i className="far fa-arrow-to-bottom"></i>
                     </button>
-                    <button className="btn btn-outline-warning btn-sm rounded-circle mr-1" onClick={() => zoomOut()}>
+                    <button className="btn btn-outline-info btn-sm rounded-circle mr-1" onClick={() => zoomIn()}>
-                      <i className="fa fa-minus"></i>
+                      <i className="far fa-plus"></i>
                     </button>
-                    <button className="btn btn-outline-danger btn-sm rounded-circle mr-1" onClick={() => resetTransform()}>
+                    <button className="btn btn-outline-info btn-sm rounded-circle mr-1" onClick={() => zoomOut()}>
-                      <i className="fa fa-arrow-circle-left"></i>
+                      <i className="far fa-minus"></i>
+                    </button>
+                    <button className="btn btn-outline-info btn-sm rounded-circle mr-1" onClick={() => resetTransform()}>
+                      <i className="far fa-arrow-circle-left"></i>
                     </button>
                   </div>
                   <TransformComponent contentStyle={{ zIndex: 2 }}>