After installing SharePoint 2013. I had open the central admin page, But it does not have any image and CSS style.
Are there any error messages when you installed SP?
Try to run configuration wizard again.
Check if the Windows Authentication is enable (in IIS > sites > CA). If not, enable and rest iis.
Several similar post with solutions for your reference: https://social.technet.microsoft.com/Forums/en-US/3353ad18-4390-4576-90bd-7b91e4e1f577/central-administration-blank-page-after-successful-installation?forum=sharepointadmin https://hpatel.wordpress.com/2013/12/11/getting-blank-for-sharepoint-central-administration-after-installing-sharepoint-2010-in-windows-7-64-bit/