define button styles

theme.json

@@ -61,7 +61,7 @@
 			]
 		},
 		"layout": {
-			"contentSize": "1480px",
+			"contentSize": "640px",
 			"wideSize": "1760px"
 		},
 		"typography": {
@@ -511,6 +511,58 @@
 	},
 	"styles": {
 		"blocks": {
+			"core/button": {
+				"border": {
+					"bottom": {
+						"color": "var(--wp--preset--color--black)",
+						"style": "solid",
+						"width": "1px"
+					},
+					"left": {
+						"color": "var(--wp--preset--color--black)",
+						"style": "solid",
+						"width": "1px"
+					},
+					"radius": "0px",
+					"right": {
+						"color": "var(--wp--preset--color--black)",
+						"style": "solid",
+						"width": "1px"
+					},
+					"top": {
+						"color": "var(--wp--preset--color--black)",
+						"style": "solid",
+						"width": "1px"
+					}
+				},
+				"color": {
+					"gradient": "var(--wp--preset--gradient--violet-to-green)",
+					"text": "var(--wp--preset--color--black)"
+				},
+				"elements": {
+					"link": {
+						"color": {
+							"text": "var(--wp--preset--color--black)"
+						}
+					}
+				},
+				"spacing": {
+					"padding": {
+						"bottom": "0.75em",
+						"left": "2.5em",
+						"right": "2.5em",
+						"top": "0.75em"
+					}
+				},
+				"typography": {
+					"fontFamily": "var(--wp--preset--font-family--instrument-sans)",
+					"fontStyle": "normal",
+					"fontWeight": "700",
+					"letterSpacing": "0.48px",
+					"lineHeight": "1",
+					"textTransform": "none"
+				}
+			},
 			"core/heading": {
 				"color": {
 					"text": "var(--wp--preset--color--black)"