Index: clang-tools-extra/clang-doc/HTMLGenerator.cpp
===================================================================
--- clang-tools-extra/clang-doc/HTMLGenerator.cpp
+++ clang-tools-extra/clang-doc/HTMLGenerator.cpp
@@ -34,6 +34,7 @@
     TAG_UL,
     TAG_LI,
     TAG_A,
+    TAG_LINK,
   };
 
   HTMLTag() = default;
@@ -106,6 +107,7 @@
 bool HTMLTag::IsSelfClosing() const {
   switch (Value) {
   case HTMLTag::TAG_META:
+  case HTMLTag::TAG_LINK:
     return true;
   case HTMLTag::TAG_TITLE:
   case HTMLTag::TAG_DIV:
@@ -129,6 +131,7 @@
   case HTMLTag::TAG_H3:
   case HTMLTag::TAG_LI:
   case HTMLTag::TAG_A:
+  case HTMLTag::TAG_LINK:
     return true;
   case HTMLTag::TAG_DIV:
   case HTMLTag::TAG_P:
@@ -159,6 +162,8 @@
     return llvm::SmallString<16>("li");
   case HTMLTag::TAG_A:
     return llvm::SmallString<16>("a");
+  case HTMLTag::TAG_LINK:
+    return llvm::SmallString<16>("link");
   }
 }
 
@@ -577,6 +582,12 @@
 
   F.Children.emplace_back(
       llvm::make_unique<TagNode>(HTMLTag::TAG_TITLE, InfoTitle));
+  auto LinkNode = llvm::make_unique<TagNode>(HTMLTag::TAG_LINK);
+  LinkNode->Attributes.try_emplace("rel", "stylesheet");
+  SmallString<128> StylesheetPath = computeRelativePath("", I->Path);
+  llvm::sys::path::append(StylesheetPath, "clang-doc-default-stylesheet.css");
+  LinkNode->Attributes.try_emplace("href", StylesheetPath);
+  F.Children.emplace_back(std::move(LinkNode));
   F.Children.emplace_back(std::move(MainContentNode));
   F.Render(OS);
 
Index: clang-tools-extra/clang-doc/stylesheets/clang-doc-default-stylesheet.css
===================================================================
--- /dev/null
+++ clang-tools-extra/clang-doc/stylesheets/clang-doc-default-stylesheet.css
@@ -0,0 +1,205 @@
+body,div {
+  margin: 0;
+  padding: 0;
+}
+
+body[no-overflow] {
+  overflow: hidden;
+}
+
+li>p:first-child {
+  margin-top: 0;
+}
+
+li>p:last-child {
+  margin-bottom: 0;
+}
+
+html {
+  -webkit-box-sizing: border-box;
+  box-sizing: border-box;
+}
+
+*,*::before,*::after {
+  -webkit-box-sizing: inherit;
+  box-sizing: inherit;
+}
+
+body,html {
+  color: #202124;
+  font: 400 16px/24px Roboto,sans-serif;
+  -moz-osx-font-smoothing: grayscale;
+  -webkit-font-smoothing: antialiased;
+  height: 100%;
+  margin: 36px;
+  -webkit-text-size-adjust: 100%;
+  -moz-text-size-adjust: 100%;
+  -ms-text-size-adjust: 100%;
+  text-size-adjust: 100%;
+}
+
+body[devsite-framebox] {
+  overflow: hidden;
+  padding: 20px;
+}
+
+body[sitemask--active] {
+  overflow: hidden;
+}
+
+p {
+  margin: 16px 0;
+  padding: 0;
+}
+
+:link,:visited {
+  color: #039be5;
+  outline: 0;
+  text-decoration: none;
+}
+
+ul {
+  margin: 0;
+  padding-left: 40px;
+}
+
+ul {
+  list-style: disc outside;
+}
+
+li,li p {
+  margin: 12px 0;
+  padding: 0;
+}
+
+*[visually-hidden] {
+  opacity: 0 !important;
+  pointer-events: none !important;
+  visibility: hidden !important;
+}
+
+*[hidden] {
+  display: none !important;
+}
+
+[render-hidden] {
+  display: inline !important;
+  position: absolute !important;
+  visibility: hidden !important;
+}
+
+*[no-scroll] {
+  overflow: hidden;
+}
+
+@supports (display: flex) {
+  body[ready] .devsite-wrapper {
+    display: -webkit-box;
+    display: -ms-flexbox;
+    display: flex;
+    -webkit-box-orient: vertical;
+    -webkit-box-direction: normal;
+    -ms-flex-direction: column;
+    flex-direction: column;
+  }
+}
+
+@media screen and (max-width: 840px) {
+  body[devsite-book-nav--open] {
+    overflow: hidden;
+  }
+}
+
+h1,h2,h3,h4,h5,h6 {
+  overflow: hidden;
+  padding: 0;
+  text-overflow: ellipsis;
+}
+
+h1 {
+  color: #80868b;
+  font: 300 34px/40px Roboto,sans-serif;
+  letter-spacing: -0.01em;
+  margin: 40px 0 20px;
+}
+
+[layout=docs] h2 {
+  border-bottom: 1px solid #e8eaed;
+  padding-bottom: 3px;
+}
+
+h2 {
+  font: 300 24px/32px Roboto,sans-serif;
+  letter-spacing: -0.01em;
+  margin: 40px 0 20px;
+}
+
+h3 {
+  font: 400 20px/32px Roboto,sans-serif;
+  margin: 32px 0 16px;
+}
+
+h4,h5,h6 {
+  margin: 32px 0 16px;
+}
+
+h4 {
+  font: 500 16px/24px Roboto,sans-serif;
+}
+
+h5 {
+  font: 700 14px/24px Roboto,sans-serif;
+}
+
+h6 {
+  font: 500 14px/24px Roboto,sans-serif;
+}
+
+h1+h1,h1+h2,h1+h3,h1+h4,h1+h5,h1+h6,h2+h1,h2+h2,h2+h3,h2+h4,h2+h5,h2+h6,h3+h1,h3+h2,h3+h3,h3+h4,h3+h5,h3+h6,h4+h1,h4+h2,h4+h3,h4+h4,h4+h5,h4+h6,h5+h1,h5+h2,h5+h3,h5+h4,h5+h5,h5+h6,h6+h1,h6+h2,h6+h3,h6+h4,h6+h5,h6+h6 {
+  margin-top: 0;
+}
+
+@media screen and (max-width: 600px) {
+  h1 {
+    font: 300 24px/32px Roboto,sans-serif;
+  }
+}
+
+[scrollbars]::-webkit-scrollbar {
+  height: 8px;
+  width: 8px;
+}
+
+[scrollbars]::-webkit-scrollbar-thumb {
+  background: rgba(128,134,139,.26);
+  border-radius: 8px;
+}
+
+[no-horizontal-scrollbars]::-webkit-scrollbar {
+  height: 0;
+  width: 0;
+}
+
+[scrollbars]::-webkit-scrollbar-corner {
+  background: 0;
+}
+
+[background] h2 {
+  color: #fff;
+}
+
+@media print {
+  body,  html,  :link,  :visited,  h1,  h2,  h3,  h4,  h5,  h6 {
+    color: #000 !important;
+    padding-left: 0 !important;
+    padding-right: 0 !important;
+  }
+
+  :link,  :visited {
+    text-decoration: underline;
+  }
+}
+
+@page {
+  margin: .75in;
+}
Index: clang-tools-extra/clang-doc/tool/ClangDocMain.cpp
===================================================================
--- clang-tools-extra/clang-doc/tool/ClangDocMain.cpp
+++ clang-tools-extra/clang-doc/tool/ClangDocMain.cpp
@@ -35,6 +35,7 @@
 #include "llvm/Support/CommandLine.h"
 #include "llvm/Support/Error.h"
 #include "llvm/Support/FileSystem.h"
+#include "llvm/Support/MemoryBuffer.h"
 #include "llvm/Support/Path.h"
 #include "llvm/Support/Process.h"
 #include "llvm/Support/Signals.h"
@@ -239,5 +240,36 @@
       llvm::errs() << toString(std::move(Err)) << "\n";
   }
 
+  // Generate css stylesheet
+  if (Format == "html") {
+    llvm::outs() << "Generating stylesheet for docs...\n";
+    auto StylesheetPathWrite = getInfoOutputFile(
+        OutDirectory, "", "clang-doc-default-stylesheet", ".css");
+    if (!StylesheetPathWrite) {
+      llvm::errs() << toString(StylesheetPathWrite.takeError()) << "\n";
+      return 1;
+    }
+    std::error_code FileErr;
+    llvm::raw_fd_ostream InfoOS(StylesheetPathWrite.get(), FileErr,
+                                llvm::sys::fs::F_None);
+    if (FileErr != OK) {
+      llvm::errs() << "Error creating stylesheet file: " << FileErr.message()
+                   << "\n";
+      return 1;
+    }
+    llvm::SmallString<128> StylesheetPathRead;
+    llvm::sys::path::native("clang-tools-extra/clang-doc/stylesheets/"
+                            "clang-doc-default-stylesheet.css",
+                            StylesheetPathRead);
+    auto StylesheetFileStream =
+        llvm::MemoryBuffer::getFileAsStream(StylesheetPathRead);
+    if (std::error_code Err = StylesheetFileStream.getError()) {
+      llvm::errs() << "Error reading stylesheet file: " << Err.message()
+                   << "\n";
+      return 1;
+    }
+    InfoOS << StylesheetFileStream.get()->getBuffer();
+  }
+
   return 0;
 }
Index: clang-tools-extra/unittests/clang-doc/HTMLGeneratorTest.cpp
===================================================================
--- clang-tools-extra/unittests/clang-doc/HTMLGeneratorTest.cpp
+++ clang-tools-extra/unittests/clang-doc/HTMLGeneratorTest.cpp
@@ -43,6 +43,7 @@
   std::string Expected = R"raw(<!DOCTYPE html>
 <meta charset="utf-8"/>
 <title>namespace Namespace</title>
+<link rel="stylesheet" href="clang-doc-default-stylesheet.css"/>
 <div>
   <h1>namespace Namespace</h1>
   <h2>Namespaces</h2>
@@ -101,6 +102,7 @@
   std::string Expected = R"raw(<!DOCTYPE html>
 <meta charset="utf-8"/>
 <title>class r</title>
+<link rel="stylesheet" href="../../../clang-doc-default-stylesheet.css"/>
 <div>
   <h1>class r</h1>
   <p>
@@ -160,6 +162,7 @@
   std::string Expected = R"raw(<!DOCTYPE html>
 <meta charset="utf-8"/>
 <title></title>
+<link rel="stylesheet" href="clang-doc-default-stylesheet.css"/>
 <div>
   <h3>f</h3>
   <p>
@@ -199,6 +202,7 @@
   std::string Expected = R"raw(<!DOCTYPE html>
 <meta charset="utf-8"/>
 <title></title>
+<link rel="stylesheet" href="clang-doc-default-stylesheet.css"/>
 <div>
   <h3>enum class e</h3>
   <ul>
@@ -259,6 +263,7 @@
   std::string Expected = R"raw(<!DOCTYPE html>
 <meta charset="utf-8"/>
 <title></title>
+<link rel="stylesheet" href="clang-doc-default-stylesheet.css"/>
 <div>
   <h3>f</h3>
   <p>