screen-demo/map-example/cesium/Source/Widgets/InfoBox/InfoBox.css

.cesium-infoBox {
  display: block;
  position: absolute;
  top: 50px;
  right: 0;
  width: 40%;
  max-width: 480px;
  background: rgba(38, 38, 38, 0.95);
  color: #edffff;
  border: 1px solid #444;
  border-right: none;
  border-top-left-radius: 7px;
  border-bottom-left-radius: 7px;
  box-shadow: 0 0 10px 1px #000;
  transform: translate(100%, 0);
  visibility: hidden;
  opacity: 0;
  transition: visibility 0s 0.2s, opacity 0.2s ease-in, transform 0.2s ease-in;
}

.cesium-infoBox-visible {
  transform: translate(0, 0);
  visibility: visible;
  opacity: 1;
  transition: opacity 0.2s ease-out, transform 0.2s ease-out;
}

.cesium-infoBox-title {
  display: block;
  height: 20px;
  padding: 5px 30px 5px 25px;
  background: rgba(84, 84, 84, 1);
  border-top-left-radius: 7px;
  text-align: center;
  text-overflow: ellipsis;
  white-space: nowrap;
  overflow: hidden;
  box-sizing: content-box;
}

.cesium-infoBox-bodyless .cesium-infoBox-title {
  border-bottom-left-radius: 7px;
}

button.cesium-infoBox-camera {
  display: block;
  position: absolute;
  top: 4px;
  left: 4px;
  width: 22px;
  height: 22px;
  background: transparent;
  border-color: transparent;
  border-radius: 3px;
  padding: 0 5px;
  margin: 0;
}

button.cesium-infoBox-close {
  display: block;
  position: absolute;
  top: 5px;
  right: 5px;
  height: 20px;
  background: transparent;
  border: none;
  border-radius: 2px;
  font-weight: bold;
  font-size: 16px;
  padding: 0 5px;
  margin: 0;
  color: #edffff;
}

button.cesium-infoBox-close:focus {
  background: rgba(238, 136, 0, 0.44);
  outline: none;
}

button.cesium-infoBox-close:hover {
  background: #888;
  color: #000;
}

button.cesium-infoBox-close:active {
  background: #a00;
  color: #000;
}

.cesium-infoBox-bodyless .cesium-infoBox-iframe {
  display: none;
}

.cesium-infoBox-iframe {
  border: none;
  width: 100%; /* Fallback */
  width: calc(100% - 2px);
}