[{"selector": "node", "css": {
    "text-valign": "center",
    "text-halign": "center",
    "content": "data(id)",
    "border-color": "red",
    "background-color": "white",
    "border-width": 1,
    "height": 60,
    "width": 60
    }},
 {"selector": "node:selected", "css": {
     "overlay-color": "gray",
     "overlay-opacity": 0.4
     }},
 {"selector": "edge", "css": {
     "width": "1px",
     "line-color": "black",
     "target-arrow-shape": "triangle",
     "target-arrow-color": "black",
     "curve-style": "bezier"
     }},
 {"selector": "edge:selected", "css": {
     "overlay-color": "gray",
     "overlay-opacity": 0.4
     }}
]

