diff --git a/.env.example b/.env.example
index 48f9687..2f47748 100644
--- a/.env.example
+++ b/.env.example
@@ -78,11 +78,11 @@
 # Label for the message field.
 # BOOK_LABEL_MESSAGE=Your message:
 
-# Number of rows for the message textarea.
-# BOOK_TEXTAREA_ROWS=8
+# Message textarea width in pixels.
+# BOOK_TEXTAREA_WIDTH=400
 
-# Number of columns for the message textarea.
-# BOOK_TEXTAREA_COLS=60
+# Message textarea height in pixels.
+# BOOK_TEXTAREA_HEIGHT=150
 
 # Custom HTML template file with {{title}}, {{form}}, {{entries}}, and {{style}} placeholders.
 # Uses built-in default if unset.
diff --git a/README.md b/README.md
index 25f440b..48d1af0 100644
--- a/README.md
+++ b/README.md
@@ -167,11 +167,11 @@ Running `guestbook` with no env vars will give you a working guestbook on `local
 # Label for the message field.
 # BOOK_LABEL_MESSAGE=Your message:
 
-# Number of rows for the message textarea.
-# BOOK_TEXTAREA_ROWS=8
+# Message textarea width in pixels.
+# BOOK_TEXTAREA_WIDTH=400
 
-# Number of columns for the message textarea.
-# BOOK_TEXTAREA_COLS=60
+# Message textarea height in pixels.
+# BOOK_TEXTAREA_HEIGHT=150
 
 # Custom HTML template file with {{title}}, {{form}}, {{entries}}, and {{style}} placeholders.
 # Uses built-in default if unset.
@@ -235,8 +235,8 @@ services.guestbook = {
       message = "Your message:";
     };
     message = {
-      rows = 8;
-      cols = 60;
+      width = 400;
+      height = 150;
     };
   };
 };
@@ -286,8 +286,8 @@ The `status` field can be `pending`, `approved`, or `denied`. Only approved entr
     title   - Site title (BOOK_SITE_TITLE). Useful in <title> and headings.
     form    - The submission form (labels, inputs, button). Controlled by
               BOOK_FORM_PROMPT, BOOK_LABEL_NAME, BOOK_LABEL_WEBSITE,
-              BOOK_LABEL_MESSAGE, BOOK_BUTTON_TEXT, BOOK_TEXTAREA_ROWS,
-              BOOK_TEXTAREA_COLS. Empty when BOOK_ENABLE_SUBMISSIONS=false.
+              BOOK_LABEL_MESSAGE, BOOK_BUTTON_TEXT, BOOK_TEXTAREA_WIDTH,
+              BOOK_TEXTAREA_HEIGHT. Empty when BOOK_ENABLE_SUBMISSIONS=false.
     entries - Approved guestbook entries, newest first. Entry separator
               controlled by BOOK_SEPARATOR.
     style   - Custom CSS from BOOK_STYLE or BOOK_STYLE_FILE, wrapped in
@@ -340,6 +340,16 @@ entries
 .guestbook-textarea {}
 .guestbook-button {}
 
+/* Drawings */
+.guestbook-canvas {
+  border: 1px solid #000;
+  cursor: crosshair;
+}
+.guestbook-canvas-reset {}
+.entry-drawing {
+  max-width: 100%;
+}
+
 /* Entries */
 .entry-header {}
 .entry-name {}
diff --git a/module.nix b/module.nix
index 09647c3..c6200c3 100644
--- a/module.nix
+++ b/module.nix
@@ -203,16 +203,16 @@ in
       };
 
       message = {
-        rows = mkOption {
+        width = mkOption {
           type = types.int;
-          default = 8;
-          description = "Number of rows for the message textarea.";
+          default = 400;
+          description = "Message textarea width in pixels.";
         };
 
-        cols = mkOption {
+        height = mkOption {
           type = types.int;
-          default = 60;
-          description = "Number of columns for the message textarea.";
+          default = 150;
+          description = "Message textarea height in pixels.";
         };
       };
     };
@@ -249,8 +249,8 @@ in
           BOOK_LABEL_NAME = cfg.styles.labels.name;
           BOOK_LABEL_WEBSITE = cfg.styles.labels.website;
           BOOK_LABEL_MESSAGE = cfg.styles.labels.message;
-          BOOK_TEXTAREA_ROWS = toString cfg.styles.message.rows;
-          BOOK_TEXTAREA_COLS = toString cfg.styles.message.cols;
+          BOOK_TEXTAREA_WIDTH = toString cfg.styles.message.width;
+          BOOK_TEXTAREA_HEIGHT = toString cfg.styles.message.height;
         } // lib.optionalAttrs (cfg.styles.cssFile != null) {
           BOOK_STYLE_FILE = cfg.styles.cssFile;
         } // lib.optionalAttrs (cfg.styles.templateFile != null) {
diff --git a/src/config.rs b/src/config.rs
index 6806929..6633961 100644
--- a/src/config.rs
+++ b/src/config.rs
@@ -33,8 +33,8 @@ pub struct Config {
     pub label_name: String,
     pub label_website: String,
     pub label_message: String,
-    pub textarea_rows: u32,
-    pub textarea_cols: u32,
+    pub textarea_width: u32,
+    pub textarea_height: u32,
 }
 
 impl Config {
@@ -138,14 +138,14 @@ impl Config {
                 .unwrap_or_else(|_| "Your website (optional):".into()),
             label_message: env::var("BOOK_LABEL_MESSAGE")
                 .unwrap_or_else(|_| "Your message:".into()),
-            textarea_rows: env::var("BOOK_TEXTAREA_ROWS")
-                .unwrap_or_else(|_| "8".into())
+            textarea_width: env::var("BOOK_TEXTAREA_WIDTH")
+                .unwrap_or_else(|_| "400".into())
                 .parse()
-                .map_err(|_| "BOOK_TEXTAREA_ROWS must be a number")?,
-            textarea_cols: env::var("BOOK_TEXTAREA_COLS")
-                .unwrap_or_else(|_| "60".into())
+                .map_err(|_| "BOOK_TEXTAREA_WIDTH must be a number")?,
+            textarea_height: env::var("BOOK_TEXTAREA_HEIGHT")
+                .unwrap_or_else(|_| "150".into())
                 .parse()
-                .map_err(|_| "BOOK_TEXTAREA_COLS must be a number")?,
+                .map_err(|_| "BOOK_TEXTAREA_HEIGHT must be a number")?,
         })
     }
 }
diff --git a/src/render.rs b/src/render.rs
index 338f756..07ab1b4 100644
--- a/src/render.rs
+++ b/src/render.rs
@@ -40,8 +40,7 @@ pub fn render_form(config: &Config) -> String {
 
     let drawing_section = if config.enable_drawings {
         format!(
-            r##"
-<label class="guestbook-label">{label}</label>
+            r##"<label class="guestbook-label">{label}</label>
 <canvas class="guestbook-canvas" width="{w}" height="{h}"></canvas>
 <a href="#" class="guestbook-canvas-reset">Reset</a>
 <input type="hidden" name="drawing">
@@ -87,7 +86,7 @@ pub fn render_form(config: &Config) -> String {
 <input class="guestbook-input" name="name" required>
 {website_section}
 <label class="guestbook-label">{label_message}</label>
-<textarea class="guestbook-textarea" name="message" rows="{rows}" cols="{cols}" required></textarea>
+<textarea class="guestbook-textarea" name="message" style="width:{tw}px;height:{th}px" required></textarea>
 {captcha_section}
 {drawing_section}
 <input name="url" style="display:none" tabindex="-1" autocomplete="off">
@@ -97,8 +96,8 @@ pub fn render_form(config: &Config) -> String {
         label_name = config.label_name,
         website_section = website_section,
         label_message = config.label_message,
-        rows = config.textarea_rows,
-        cols = config.textarea_cols,
+        tw = config.textarea_width,
+        th = config.textarea_height,
         captcha_section = captcha_section,
         drawing_section = drawing_section,
         button = config.button_text,
@@ -196,8 +195,8 @@ mod tests {
             label_name: "Your name:".into(),
             label_website: "Your website (optional):".into(),
             label_message: "Your message:".into(),
-            textarea_rows: 8,
-            textarea_cols: 60,
+            textarea_width: 400,
+            textarea_height: 150,
         }
     }
 
@@ -298,11 +297,11 @@ mod tests {
     #[test]
     fn test_render_form_custom_textarea() {
         let mut config = test_config();
-        config.textarea_rows = 12;
-        config.textarea_cols = 40;
+        config.textarea_width = 500;
+        config.textarea_height = 200;
         let form = render_form(&config);
-        assert!(form.contains("rows=\"12\""));
-        assert!(form.contains("cols=\"40\""));
+        assert!(form.contains("width:500px"));
+        assert!(form.contains("height:200px"));
     }
 
     #[test]
@@ -424,6 +423,6 @@ mod tests {
         let entry = make_entry("alice", "2026-04-09", "Hello!");
         let form = render_form(&config);
         let html = render_page(DEFAULT_TEMPLATE, &config, &[entry], &form);
-        assert!(!html.contains("entry-drawing"));
+        assert!(!html.contains("<img class=\"entry-drawing\""));
     }
 }
diff --git a/src/web.rs b/src/web.rs
index 9c8d908..26392d1 100644
--- a/src/web.rs
+++ b/src/web.rs
@@ -275,8 +275,8 @@ mod tests {
             label_name: "Your name:".into(),
             label_website: "Your website (optional):".into(),
             label_message: "Your message:".into(),
-            textarea_rows: 8,
-            textarea_cols: 60,
+            textarea_width: 400,
+            textarea_height: 150,
         }
     }
 
diff --git a/templates/default.css b/templates/default.css
index f5df6db..91d8ba1 100644
--- a/templates/default.css
+++ b/templates/default.css
@@ -12,9 +12,21 @@
 .guestbook-form {}
 .guestbook-label {}
 .guestbook-input {}
-.guestbook-textarea {}
+.guestbook-textarea {
+  box-sizing: border-box;
+}
 .guestbook-button {}
 
+/* Drawings */
+.guestbook-canvas {
+  border: 1px solid #000;
+  cursor: crosshair;
+}
+.guestbook-canvas-reset {}
+.entry-drawing {
+  max-width: 100%;
+}
+
 /* Entries */
 .entry-header {}
 .entry-name {}