monaco-editor: Can not create two editor with different theme

monaco-editor version: 0.14.2 & 0.18.1 Browser: chrome 69 OS: macOS Mojave 10.14 Playground code that reproduces the issue:

monaco.editor.create(document.getElementById("container"), {
	value: "function hello() {\n\talert('Hello world!');\n}",
        theme: 'vs-light',
	language: "javascript"
});


monaco.editor.create(document.getElementById("container1"), {
	value: "function hello() {\n\talert('Hello Monaco!');\n}",
        theme: 'vs-dark',
	language: "javascript"
});

<div id="container" style="height:30%;"></div>
<hr>
<div id="container1" style="height:30%;"></div>

I set dark theme and light theme, but all show dark theme