fine-tune style of Configure Java Runtime page (#558)

Signed-off-by: Yan Zhang <[email protected]>

Author: Eskibear

src/java-runtime/assets/index.ts

@@ -11,6 +11,7 @@ import { JdkConfigurationPanel } from "./jdk.configure";
 import { JdkInstallationPanel } from "./jdk.installation";
 import { requestJdkInfo } from "./vscode.api";
 import bytes = require("bytes");
+import "./style.scss";
 
 window.addEventListener("message", event => {
   if (event.data.command === "applyJdkInfo") {

src/java-runtime/assets/style.scss

@@ -0,0 +1,3 @@
+div.container {
+    min-width: 550px;
+}