Install wkhtmltopdf reference from http://wkhtmltopdf.org/downloads.html
Step 1: Preparation
Login to your CentOS machine. Make sure that you have root access. It is up to you on how you gain a root access by logging in directly as root user or do an su - command.
Step 2: Install Dependencies
Now that I mentioned it, there are two items needed in order to install the wkhtmltopdf:
Install the two items with the following command
yum install -y xorg-x11-fonts-75dpi yum install -y xorg-x11-fonts-Type1
Step 3: Install wkhtmltopdf
Next, download the wkhtmltopdf
Next, download the wkhtmltopdf RPM file.
link to download directly http://download.gna.org/wkhtmltopdf/0.12/0.12.2.1/wkhtmltox-0.12.2.1_linux-centos6-amd64.rpm
Alternatively, if your computer is a 32-bit architecture, you may download the 32-bit version available in the Downloads page of the said site.
After the file has been downloaded, run the command:
rpm -Uvh wkhtmltox-0.12.2.1_linux-centos6-amd64.rpm
And if for the 32-bit computers, run the command instead:
rpm -Uvh wkhtmltox-0.12.2.1_linux-centos6-i386.rpm
NOTE : if you run using php then write font-weight:bold in css style.