diff --git a/src/lib.rs b/src/lib.rs
index 19944bb..a2a35bc 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -8,8 +8,6 @@ use range_map::RangeMap;
 
 pub struct JotdownBufferIter<'a, T: Iterator<Item = Event<'a>>> {
     djot: T,
-    width: f32,
-    metrics: Metrics,
     indent: Vec<Indent>,
 }
 
@@ -86,10 +84,7 @@ impl<'a, 'b, T: Iterator<Item = Event<'a>>> Iterator for JotdownIntoBuffer<'a, '
                 }
                 Event::Start(container, _) => match container {
                     Container::Heading { level, .. } => {
-                        self.metrics = Metrics::new(
-                            self.metrics.font_size * (4.0 - level as f32),
-                            self.metrics.line_height * (4.0 - level as f32),
-                        );
+                        self.metrics = Metrics::new(4.0 - level as f32, 4.0 - level as f32);
                     }
                     Container::Emphasis => self.attrs = self.attrs.style(Style::Italic),
                     Container::Strong => self.attrs = self.attrs.weight(Weight::BOLD),
@@ -141,12 +136,22 @@ pub struct JotdownItem<'a> {
     pub metrics: Metrics,
     pub image_url: Option<Cow<'a, str>>,
     pub url_map: Option<RangeMap<usize, &'a str>>,
-    pub width: f32,
 }
 
 impl<'a> JotdownItem<'a> {
-    pub fn make_buffer(&self, font_system: &mut FontSystem) -> Buffer {
-        let mut buffer = Buffer::new(font_system, self.metrics);
+    pub fn make_buffer(
+        &self,
+        font_system: &mut FontSystem,
+        width: f32,
+        metrics: Metrics,
+    ) -> Buffer {
+        let mut buffer = Buffer::new(
+            font_system,
+            Metrics::new(
+                metrics.font_size * self.metrics.font_size,
+                metrics.line_height * self.metrics.line_height,
+            ),
+        );
         buffer.set_rich_text(
             font_system,
             self.buffer.iter().cloned(),
@@ -155,7 +160,7 @@ impl<'a> JotdownItem<'a> {
         );
 
         buffer.set_wrap(font_system, cosmic_text::Wrap::WordOrGlyph);
-        buffer.set_size(font_system, self.width - self.indent.indent, f32::MAX);
+        buffer.set_size(font_system, width - self.indent.indent, f32::MAX);
         buffer.shape_until_scroll(font_system, false);
         buffer
     }
@@ -168,9 +173,9 @@ impl<'a, T: Iterator<Item = Event<'a>>> Iterator for JotdownBufferIter<'a, T> {
         let mut jot = JotdownIntoBuffer {
             djot: &mut self.djot,
             attrs: Attrs::new().family(Family::SansSerif),
-            metrics: self.metrics,
             indent: &mut self.indent,
             image_url: None,
+            metrics: Metrics::new(1.0, 1.0),
             added: false,
             link_start: 0,
             location: 0,
@@ -196,7 +201,6 @@ impl<'a, T: Iterator<Item = Event<'a>>> Iterator for JotdownBufferIter<'a, T> {
                 buffer,
                 image_url,
                 metrics,
-                width: self.width,
             });
         }
     }
@@ -204,13 +208,9 @@ impl<'a, T: Iterator<Item = Event<'a>>> Iterator for JotdownBufferIter<'a, T> {
 
 pub fn jotdown_into_buffers<'a, T: Iterator<Item = Event<'a>>>(
     djot: T,
-    metrics: Metrics,
-    width: f32,
 ) -> JotdownBufferIter<'a, T> {
     JotdownBufferIter {
         djot,
-        width,
-        metrics,
         indent: Vec::new(),
     }
 }