diff --git a/glamour.go b/glamour.go
index ad52cea..4395c26 100644
--- a/glamour.go
+++ b/glamour.go
@@ -28,8 +28,10 @@ const (
 	PinkStyle    = "pink"
 )
 
-const defaultWidth = 80
-const highPriority = 1000
+const (
+	defaultWidth = 80
+	highPriority = 1000
+)
 
 // A TermRendererOption sets an option on a TermRenderer.
 type TermRendererOption func(*TermRenderer) error
diff --git a/glamour_test.go b/glamour_test.go
index 1540310..0448b3a 100644
--- a/glamour_test.go
+++ b/glamour_test.go
@@ -2,6 +2,7 @@ package glamour
 
 import (
 	"bytes"
+	"errors"
 	"io"
 	"os"
 	"strings"
@@ -43,7 +44,7 @@ func TestTermRendererWriter(t *testing.T) {
 
 	// generate
 	if generate {
-		err := os.WriteFile(testFile, b, 0644)
+		err := os.WriteFile(testFile, b, 0o644)
 		if err != nil {
 			t.Fatal(err)
 		}
@@ -167,6 +168,46 @@ func TestStyles(t *testing.T) {
 	}
 }
 
+// TestCustomStyle checks the expected errors with custom styling. We need to
+// support built-in styles and custom style sheets.
+func TestCustomStyle(t *testing.T) {
+	md := "testdata/example.md"
+	tests := []struct {
+		name      string
+		stylePath string
+		err       error
+		expected  string
+	}{
+		{name: "style exists", stylePath: "testdata/custom.style", err: nil, expected: "testdata/custom.style"},
+		{name: "style doesn't exist", stylePath: "testdata/notfound.style", err: os.ErrNotExist, expected: AutoStyle},
+		{name: "style is empty", stylePath: "", err: nil, expected: AutoStyle},
+	}
+
+	for _, tc := range tests {
+		t.Run(tc.name, func(t *testing.T) {
+			t.Setenv("GLAMOUR_STYLE", tc.stylePath)
+			g, err := NewTermRenderer(
+				WithEnvironmentConfig(),
+			)
+			if !errors.Is(err, tc.err) {
+				t.Fatal(err)
+			}
+			if !errors.Is(tc.err, os.ErrNotExist) {
+				w, err := NewTermRenderer(WithStylePath(tc.expected))
+				if err != nil {
+					t.Fatal(err)
+				}
+				text, _ := os.ReadFile(md)
+				want, err := w.RenderBytes(text)
+				got, err := g.RenderBytes(text)
+				if !bytes.Equal(want, got) {
+					t.Error("Wrong style used")
+				}
+			}
+		})
+	}
+}
+
 func TestRenderHelpers(t *testing.T) {
 	in, err := os.ReadFile(markdown)
 	if err != nil {
diff --git a/testdata/custom.style b/testdata/custom.style
new file mode 100644
index 0000000..ed18a4b
--- /dev/null
+++ b/testdata/custom.style
@@ -0,0 +1,183 @@
+{
+  "document": {
+    "block_prefix": "\n",
+    "block_suffix": "\n",
+    "color": "252",
+    "margin": 2
+  },
+  "block_quote": {
+    "indent": 1,
+    "indent_token": "│ "
+  },
+  "paragraph": {},
+  "list": {
+    "level_indent": 2
+  },
+  "heading": {
+    "block_suffix": "\n",
+    "color": "39",
+    "bold": true
+  },
+  "h1": {
+    "prefix": " ",
+    "suffix": " ",
+    "color": "228",
+    "background_color": "63",
+    "bold": true
+  },
+  "h6": {
+    "prefix": " ",
+    "color": "35",
+    "bold": false
+  },
+  "text": {},
+  "strikethrough": {
+    "crossed_out": true
+  },
+  "emph": {
+    "italic": true
+  },
+  "strong": {
+    "bold": true
+  },
+  "hr": {
+    "color": "240",
+    "format": "\n--------\n"
+  },
+  "item": {
+    "block_prefix": "• "
+  },
+  "enumeration": {
+    "block_prefix": ". "
+  },
+  "task": {
+    "ticked": "[✓] ",
+    "unticked": "[ ] "
+  },
+  "link": {
+    "color": "30",
+    "underline": true
+  },
+  "link_text": {
+    "color": "35",
+    "bold": true
+  },
+  "image": {
+    "color": "212",
+    "underline": true
+  },
+  "image_text": {
+    "color": "243",
+    "format": "Image: {{.text}} →"
+  },
+  "code": {
+    "prefix": " ",
+    "suffix": " ",
+    "color": "203",
+    "background_color": "236"
+  },
+  "code_block": {
+    "color": "244",
+    "margin": 2,
+    "chroma": {
+      "text": {
+        "color": "#C4C4C4"
+      },
+      "error": {
+        "color": "#F1F1F1",
+        "background_color": "#F05B5B"
+      },
+      "comment": {
+        "color": "#676767"
+      },
+      "comment_preproc": {
+        "color": "#FF875F"
+      },
+      "keyword": {
+        "color": "#00AAFF"
+      },
+      "keyword_reserved": {
+        "color": "#FF5FD2"
+      },
+      "keyword_namespace": {
+        "color": "#FF5F87"
+      },
+      "keyword_type": {
+        "color": "#6E6ED8"
+      },
+      "operator": {
+        "color": "#EF8080"
+      },
+      "punctuation": {
+        "color": "#E8E8A8"
+      },
+      "name": {
+        "color": "#C4C4C4"
+      },
+      "name_builtin": {
+        "color": "#FF8EC7"
+      },
+      "name_tag": {
+        "color": "#B083EA"
+      },
+      "name_attribute": {
+        "color": "#7A7AE6"
+      },
+      "name_class": {
+        "color": "#F1F1F1",
+        "underline": true,
+        "bold": true
+      },
+      "name_constant": {},
+      "name_decorator": {
+        "color": "#FFFF87"
+      },
+      "name_exception": {},
+      "name_function": {
+        "color": "#00D787"
+      },
+      "name_other": {},
+      "literal": {},
+      "literal_number": {
+        "color": "#6EEFC0"
+      },
+      "literal_date": {},
+      "literal_string": {
+        "color": "#C69669"
+      },
+      "literal_string_escape": {
+        "color": "#AFFFD7"
+      },
+      "generic_deleted": {
+        "color": "#FD5B5B"
+      },
+      "generic_emph": {
+        "italic": true
+      },
+      "generic_inserted": {
+        "color": "#00D787"
+      },
+      "generic_strong": {
+        "bold": true
+      },
+      "generic_subheading": {
+        "color": "#777777"
+      },
+      "background": {
+        "background_color": "#373737"
+      }
+    }
+  },
+  "table": {
+    "center_separator": "┼",
+    "column_separator": "│",
+    "row_separator": "─"
+  },
+  "definition_list": {},
+  "definition_term": {},
+  "definition_description": {
+    "block_prefix": "\n🠶 "
+  },
+  "html_block": {},
+  "html_span": {}
+}
diff --git a/testdata/empty.style b/testdata/empty.style
new file mode 100644
index 0000000..0967ef4
--- /dev/null
+++ b/testdata/empty.style
@@ -0,0 +1 @@
+{}