mars3d-cesium/Build/Cesium/Widgets/FullscreenButton/FullscreenButton.css

CesiumJS是一个JavaScript库，用于在web浏览器中无需插件创建3D地球仪和2D地图，mars3d-cesium是mars3d团队修改版本的CesiumJS。

/* packages/widgets/Source/FullscreenButton/FullscreenButton.css */
.cesium-button.cesium-fullscreenButton {
  display: block;
  width: 100%;
  height: 100%;
  margin: 0;
  border-radius: 0;
}