add font size presets

theme.json

@@ -45,6 +45,44 @@
       ]
     },
     "typography": {
+      "fluid": true,
+      "lineHeight": true,
+      "textColumns": true,
+      "fontSizes": [
+				{
+					"name": "Small",
+					"size": "16px",
+					"slug": "sm",
+					"fluid": false
+				},
+				{
+					"name": "Medium",
+					"size": "20px",
+					"slug": "md",
+					"fluid": {
+						"min": "18px",
+						"max": "20px"
+					}
+				},
+				{
+					"name": "Large",
+					"size": "40px",
+					"slug": "lg",
+					"fluid": {
+						"min": "32px",
+						"max": "40px"
+					}
+				},
+        {
+          "name": "Extra Large",
+          "size": "48px",
+          "slug": "xl",
+          "fluid": {
+            "min": "40px",
+            "max": "48px"
+          }
+        }
+      ],
       "fontFamilies": [
         {
           "fontFamily": "'Inclusive Sans', sans-serif",