The Default V2 Config style places a thin, flat border around the main preview popup, and then adds a margin and border with a 3d effect to each screenshot to make it appear as if it's being displayed on a physical monitor.
The text below shows the config json used to display the above preview.
{
"version": 2,
"hotkey": "CTRL + ALT + SHIFT + F",
"preview": {
"name": "default_v2",
"size": {
"width": 1600,
"height": 1200
},
"canvas": {
"border": {
"color": "SystemColors.Highlight",
"width": 6,
"depth": 0
},
"padding": {
"width": 6
},
"background": {
"color1": "#0D57D2",
"color2": "#0344C0"
}
},
"screenshot": {
"margin": {
"width": 2
},
"border": {
"color": "#222222",
"width": 10,
"depth": 3
},
"background": {
"color1": "Color.MidnightBlue",
"color2": "Color.MidnightBlue"
}
}
}
}