Change Canvas Page Colour and Chart Background Colour in JSON Themes for Power BI Template - json

Question

I want to prepare a default theme and have written the JSON file below for powerbi dashboards. But I don't know how to:
Change the background colour for the canvas to white?
Change the background colour of the page (Canvas colour) to white?
Change the border colour of all visuals to black
We will then push this file to be the default theme for all of our dashboards.
{
"name": "Bardz",
"dataColors": [
"#173583",
"#7DCCE0",
"#26BCD7",
],
"minimum": "#C7F0FA",
"center": "#7CD7E8",
"maximum": "#3EAEFD",
"neutral": "#F58220",
"foreground": "#000000",
"textClasses": {
"label": {
"fontFace": "'Segoe UI', wf_segoe-ui_normal, helvetica, arial, sans-serif",
"fontSize": 9,
"color": "#040404"
},
"callout": {
"fontFace": "'Segoe UI Semibold', wf_segoe-ui_semibold, helvetica, arial, sans-serif",
"fontSize": 15
},
"title": {
"fontFace": "'Segoe UI Light', wf_segoe-ui_light, helvetica, arial, sans-serif",
"fontSize": 10
},
"header": { "fontSize": 11 }
},
"visualStyles": {
"*": {
"*": {
"background": [
{ "color": { "solid": { "color": "#E1E1E1" } }, "transparency": 5 }
],
"border": [
{
"color": { "solid": { "color": "#000000" } },
"show": true,
"radius": 1
}
],
"outspacePane": [
{
"backgroundColor": { "solid": { "color": "#FFFEFE" } },
"transparency": 15,
"foregroundColor": { "solid": { "color": "#000000" } }
}
],
"filterCard": [
{
"$id": "Applied",
"backgroundColor": { "solid": { "color": "#E4E4E4" } },
"transparency": 18
},
{
"$id": "Available",
"backgroundColor": { "solid": { "color": "#F2F2F2" } },
"transparency": 13
}
],
"visualHeader": [
{
"transparency": 35,
"foreground": { "solid": { "color": "#FFFFFF" } },
"border": { "solid": { "color": "#000000" } }
}
],
"visualTooltip": [
{
"titleFontColor": { "solid": { "color": "#454545" } },
"valueFontColor": { "solid": { "color": "#000000" } },
"background": { "solid": { "color": "#C7C5C5" } }
}
],
"visualHeaderTooltip": [
{
"titleFontColor": { "solid": { "color": "#454545" } },
"background": { "solid": { "color": "#C7C5C5" } }
}
]
}
},
"scatterChart": {
"*": {
"fillPoint": [
{
"show": true
}
],
"bubbles": [
{
"bubbleSize": -10
}
],
"background": [
{ "color": { "solid": { "color": "#FFFFFF" } }, "transparency": 100 }
]
}
},
"page": {
"*": {
"background": [
{ "color": { "solid": { "color": "#F9F9F9" } }, "transparency": 89 }
],
"outspace": [
{ "color": { "solid": { "color": "#FAFAFA" } }, "transparency": 14 }
]
}
}
}
}