diff --git a/.travis.yml b/.travis.yml
index 3260ce46..d6e1b63f 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -4,17 +4,15 @@ os:
   - linux
   - osx
 
-before_install:
-  - git submodule update --init
-
 env:
-  - BUILD_TYPE=Debug
-  - BUILD_TYPE=Release
+  - BUILD=Doc
+  - BUILD=Debug
+  - BUILD=Release
+
+matrix:
+  exclude:
+    - os: osx
+    - env: BUILD=Doc
 
 script:
-  - cmake -DCMAKE_BUILD_TYPE=$BUILD_TYPE -DFMT_PEDANTIC=ON .
-  - make -j4
-  - CTEST_OUTPUT_ON_FAILURE=1 make test
-
-after_failure:
-  - cat Testing/Temporary/LastTest.log
+  - support/travis-build.py
diff --git a/doc/build.py b/doc/build.py
index 727c4c16..7eb42dfc 100755
--- a/doc/build.py
+++ b/doc/build.py
@@ -13,9 +13,10 @@ def pip_install(package, commit=None):
     package = 'git+git://github.com/{0}.git@{1}'.format(package, commit)
   check_call(['pip', 'install', '-q', package])
 
-def build_docs(workdir, travis):
+def build_docs():
   # Create virtualenv.
-  virtualenv_dir = os.path.join(workdir, 'virtualenv')
+  doc_dir = os.path.dirname(os.path.realpath(__file__))
+  virtualenv_dir = os.path.join(doc_dir, 'virtualenv')
   check_call(['virtualenv', virtualenv_dir])
   activate_this_file = os.path.join(virtualenv_dir, 'bin', 'activate_this.py')
   execfile(activate_this_file, dict(__file__=activate_this_file))
@@ -23,8 +24,8 @@ def build_docs(workdir, travis):
   pip_install('sphinx==1.3.1')
   pip_install('michaeljones/breathe', '18bd461b4e29dde0adf5df4b3da7e5473e2c2983')
   # Build docs.
-  doc_dir = os.path.dirname(os.path.realpath(__file__))
-  p = Popen(['doxygen', '-'], stdin=PIPE)
+  cmd = ['doxygen', '-']
+  p = Popen(cmd, stdin=PIPE, cwd=doc_dir)
   p.communicate(input=r'''
       PROJECT_NAME      = C++ Format
       GENERATE_LATEX    = NO
@@ -46,13 +47,12 @@ def build_docs(workdir, travis):
       EXCLUDE_SYMBOLS   = fmt::internal::* StringValue write_str
     '''.format(os.path.dirname(doc_dir)))
   if p.returncode != 0:
-    return p.returncode
-  check_call(['sphinx-build',
-              '-D', "breathe_projects.format=" + os.path.join(os.getcwd(), "doxyxml"),
-              '-b', 'html', doc_dir, 'html'])
-  return 0
+    raise CalledProcessError(p.returncode, cmd)
+  check_call(['sphinx-build', '-D', 'breathe_projects.format=doxyxml',
+              '-b', 'html', '.', 'html'], cwd=doc_dir)
+  check_call(['lessc', '--clean-css', '--include-path=bootstrap', 'cppformat.less',
+              'html/_static/cppformat.css'], cwd=doc_dir)
+  return os.path.join(doc_dir, 'html')
 
-returncode = 1
-travis = 'TRAVIS' in os.environ
-returncode = build_docs('', travis=travis)
-exit(returncode)
+if __name__ == '__main__':
+  build_docs()
diff --git a/support/travis-build.py b/support/travis-build.py
new file mode 100755
index 00000000..8c7cae7d
--- /dev/null
+++ b/support/travis-build.py
@@ -0,0 +1,55 @@
+#!/usr/bin/env python
+# Build the project on Travis CI.
+
+from __future__ import print_function
+import errno, os, re, shutil, sys, tempfile
+from subprocess import call, check_call, Popen, PIPE, STDOUT
+
+def rmtree_if_exists(dir):
+  try:
+    shutil.rmtree(dir)
+  except OSError as e:
+    if e.errno == errno.ENOENT:
+      pass
+
+build = os.environ['BUILD']
+if build == 'Doc':
+  travis = 'TRAVIS' in os.environ
+  # Install dependencies.
+  if travis:
+    check_call(['sudo', 'apt-get', 'install', 'python-virtualenv', 'doxygen', 'node-less'])
+  cppformat_dir = os.path.dirname(os.path.dirname(os.path.realpath(__file__)))
+  sys.path.insert(0, os.path.join(cppformat_dir, 'doc'))
+  import build
+  html_dir = build.build_docs()
+  # Clone the cppformat.github.io repo.
+  repo = 'cppformat.github.io'
+  rmtree_if_exists(repo)
+  check_call(['git', 'clone', 'https://github.com/cppformat/{}.git'.format(repo)])
+  # Copy docs to the repo.
+  target_dir = os.path.join(repo, 'dev')
+  rmtree_if_exists(target_dir)
+  shutil.copytree(html_dir, target_dir)
+  if travis:
+    check_call(['git', 'config', '--global', 'user.name', 'amplbot'])
+    check_call(['git', 'config', '--global', 'user.email', 'viz@ampl.com'])
+  # Push docs to GitHub pages.
+  check_call(['git', 'add', '--all'], cwd=repo)
+  if call(['git', 'diff-index', '--quiet', 'HEAD'], cwd=repo):
+    check_call(['git', 'commit', '-m', 'Update documentation'], cwd=repo)
+    cmd = 'git push https://$KEY@github.com/cppformat/cppformat.github.io.git master'
+    p = Popen(cmd, shell=True, stdout=PIPE, stderr=STDOUT)
+    # Remove URL from output because it may contain a token.
+    print(re.sub(r'https:.*\.git', '<url>', p.communicate()[0]))
+    if p.returncode != 0:
+      raise CalledProcessError(p.returncode, cmd)
+  exit(0)
+
+check_call(['git', 'submodule', 'update', '--init'])
+check_call(['cmake', '-DCMAKE_BUILD_TYPE=' + build, '-DFMT_PEDANTIC=ON', '.'])
+check_call(['make', '-j4'])
+env = os.environ.copy()
+env['CTEST_OUTPUT_ON_FAILURE'] = '1'
+if call(['make', 'test'], env=env):
+  with open('Testing/Temporary/LastTest.log', 'r') as f:
+    print(f.read())