You need to add position: absolute;and topor bottomto your CSS, because the widget also uses absolute positioning. Adding this creates a new stack context that overrides z-index.
, " " :
Cesium.Camera.DEFAULT_VIEW_FACTOR = 0;
var viewer = new Cesium.Viewer('cesiumContainer', {
timeline: false,
animation: false,
navigationHelpButton: false
});
var skyAtmosphere = viewer.scene.skyAtmosphere;
var skyCheckbox = document.getElementById('skyCheckbox');
skyCheckbox.addEventListener('change', function() {
viewer.scene.skyAtmosphere = skyCheckbox.checked ? skyAtmosphere : undefined;
}, false);
html, body, #cesiumContainer {
width: 100%; height: 100%; margin: 0; padding: 0; overflow: hidden;
font-family: sans-serif; color: #edffff;
}
#controlPanel {
position: absolute;
top: 5px;
left: 5px;
background: rgba(42, 42, 42, 0.8);
padding: 5px 8px;
border-radius: 5px;
}
label {
cursor: pointer;
}
label:hover span {
text-decoration: underline;
}
<link href="http://cesiumjs.org/releases/1.15/Build/Cesium/Widgets/widgets.css"
rel="stylesheet"/>
<script src="http://cesiumjs.org/releases/1.15/Build/Cesium/Cesium.js">
</script>
<div id="cesiumContainer"></div>
<div id="controlPanel">
This is a floating control panel<br/>
with a translucent background color.
<p>
<label>
<input id="skyCheckbox" type="checkbox" checked />
<span>Enable atmospheric effect</span>
</label><br/>
<button class="cesium-button">Button 1</button>
<button class="cesium-button">Button 2</button>
</p>
</div>
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