Cannot click button due to canvas

I have created a webpage which uses three.js to render objects. However, I am unable to click the buttons. I think its because the canvas rendered by three.js doesn't allow any clicking. Below is my code:

    <!-- <h3>Tester</h3> -->
    <div class="container">
        <audio autoplay loop>
            <source src="audio/Menu_music.mp3" type="audio/mpeg">
        <h1 unselectable="on" class="animate-character">GAME</h1>
        <button class="button-57" role="button"><span class="text">Single Player</span><span>GO</span></button>
        <button class="button-57" role="button", id = "multiGameButton"><span class="text">Multi Player</span><span>GO</span></button>
    <script src=""></script>
    <script src="GLTFLoader.js"></script>
    <script src="OrbitControls.js"></script>
    <script src="FontLoader.js"></script>
        let scene, camera, renderer;

        function init() {
            scene = new THREE.Scene();
            const spaceTexture = new THREE.TextureLoader().load('space.jpg');

            camera = new THREE.PerspectiveCamera(40, window.innerWidth/window.innerHeight,1,5000);

            controls = new THREE.OrbitControls(camera, document.body)
            controls.addEventListener('change', renderer);

            renderer = new THREE.WebGLRenderer({antialias:true, alpha:true});
            renderer.setSize(window.innerWidth, window.innerHeight);

            let loader = new THREE.GLTFLoader();
            loader.load('./vehicle.glb', function(gltf){
                car = gltf.scene.children[0];


        function animate() {
            car.rotation.y += 0.01;
            renderer.render(scene, camera);

    <script type="text/javascript">
        document.getElementById("multiGameButton").onclick = function () {
            location.href = "../index.html";
            console.log("MultiButton pressed");

I have tried setting the z-index property for both canvas or button but it didn't work.

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