diff --git a/README.md b/README.md
index 97f53c7..a3e7a93 100644
--- a/README.md
+++ b/README.md
@@ -20,7 +20,7 @@ Usage: md2pdf [OPTION]... [FILE]...
 Options:
   -w, --watch    Watch for file changes.
   -h, --help     Print help.
-  --css          Set CSS file used for rendering.
+  --stylesheet   Set CSS file path used for rendering.
 ```
 
 ## Front matter (Experimental)
diff --git a/deno.json b/deno.json
index cb557ea..b7b9b58 100644
--- a/deno.json
+++ b/deno.json
@@ -8,10 +8,10 @@
   "tasks": {
     "cli": "deno run --allow-read --allow-write --allow-env --allow-net=0.0.0.0,127.0.0.1 --allow-run ./src/cli.ts --",
     "dev": "deno run --allow-read --allow-write --allow-env --allow-net=0.0.0.0,127.0.0.1 --allow-run ./src/cli.ts -- README.md",
-    "dev:all": "deno run --allow-read --allow-write --allow-env --allow-net=0.0.0.0,127.0.0.1 --allow-run ./src/cli.ts -w --css=src/testdata/bluecode.css -- README.md",
+    "dev:all": "deno run --allow-read --allow-write --allow-env --allow-net=0.0.0.0,127.0.0.1 --allow-run ./src/cli.ts -w --stylesheet=src/testdata/bluecode.css -- README.md",
     "dev:help": "deno run --allow-read --allow-write --allow-env --allow-net=0.0.0.0,127.0.0.1 --allow-run ./src/cli.ts --help",
     "dev:css": "deno run --allow-read --allow-write --allow-env --allow-net=0.0.0.0,127.0.0.1 --allow-run ./src/cli.ts -- ./src/testdata/bluecode.md",
-    "dev:invalidcss": "deno run --allow-read --allow-write --allow-env --allow-net=0.0.0.0,127.0.0.1 --allow-run ./src/cli.ts --css=src/testdata/redcode.css -- README.md",
+    "dev:invalidcss": "deno run --allow-read --allow-write --allow-env --allow-net=0.0.0.0,127.0.0.1 --allow-run ./src/cli.ts --stylesheet=src/testdata/redcode.css -- README.md",
     "dev:watch": "deno run --allow-read --allow-write --allow-env --allow-net=0.0.0.0,127.0.0.1 --allow-run ./src/cli.ts --watch -- README.md"
   },
   "imports": {
diff --git a/src/cli.ts b/src/cli.ts
index fa5fbad..4da0f1d 100644
--- a/src/cli.ts
+++ b/src/cli.ts
@@ -25,24 +25,6 @@ import { mdToPdf } from "./md-to-pdf.ts";
 import { getFilename } from "./utils/filename.ts";
 import type { MdToPdfOptions } from "./types.ts";
 
-async function validateArgs(
-  args: {
-    css?: string;
-  },
-): Promise<boolean> {
-  if (args.css) {
-    try {
-      await Deno.lstat(args.css);
-    } catch (_e) {
-      console.error(
-        `${brightRed("error")}: Set CSS file is not found: ${args.css}`,
-      );
-      return false;
-    }
-  }
-  return true;
-}
-
 function printHelp(): void {
   const help = `md2pdf: ${
     green("A simple CLI tool for converting markdown to PDF.")
@@ -53,7 +35,7 @@ ${gray("Usage:")} ${green("md2pdf [OPTION]... [FILE]...")}
 ${yellow("Options:")}
   ${green("-w, --watch")}    Watch for file changes.
   ${green("-h, --help")}     Print help.
-  ${green("--css")}          Set CSS file used for rendering.`;
+  ${green("--stylesheet")}   Set CSS file path used for rendering.`;
   console.log(help);
 }
 
@@ -78,12 +60,10 @@ async function generatePdfFromMarkdown(path: string, options?: MdToPdfOptions) {
 
 const args = await parseArgs(Deno.args, {
   boolean: ["w", "watch", "h", "help"],
-  string: ["css"],
+  string: ["stylesheet"],
 });
 
-if (!(await validateArgs(args))) {
-  Deno.exit(1);
-} else if (args.h || args.help) {
+if (args.h || args.help) {
   printHelp();
   Deno.exit(0);
 }
diff --git a/src/types.ts b/src/types.ts
index ed6b46c..07d5584 100644
--- a/src/types.ts
+++ b/src/types.ts
@@ -1,3 +1,3 @@
 export type MdToPdfOptions = {
-  css?: string;
+  stylesheet?: string;
 };
diff --git a/src/utils/server.ts b/src/utils/server.ts
index 689e0ae..a1ba347 100644
--- a/src/utils/server.ts
+++ b/src/utils/server.ts
@@ -40,7 +40,7 @@ export function launchHttpServer(
       } catch (_e) {
         markdown = fileContent;
       }
-      stylesheet = options?.css ? options?.css : stylesheet;
+      stylesheet = options?.stylesheet ?? stylesheet;
 
       const content = mdToHtml(markdown);
       const title = getFilename(path.split("/").at(-1) || "") || "Untitled";