Examine source code of Galaxy Cluster

{
  "theme": {
    "images": {
      "theme_frame": "GalaxyClusterMACSJ0717_Persona_Header.jpg"
    },
    "colors": {
      "frame": "#7400c1",
      "tab_background_text": "#7400c1"
    }
  },
  "version": "2.0",
  "name": "Galaxy Cluster",
  "manifest_version": 2,
  "description": "Based on the Hubble Telescope image of Galaxy Cluster MACS J0717, formed by the collision of four separate galaxy clusters, about 5.4 billion light years from Earth - the first time a collision between so many galaxy clusters has been observed. The hottest gases are blue, the coolest are red and medium-temperature gases are purple."
}