CSS file icon

CSS File Extension

Cascading Style Sheet
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    4.1 (21 votes)

What is CSS file?

CSS files are used for formatting contents and describing the presentation of a WWW website.

What kind of data can CSS files contain?

Files with CSS extension contain information regarding how given HTML elements should be displayed on give webpage. CSS files store such information as:

  • font settings (type, size, color, style),
  • line spacing and indentation,
  • embedded HTML elements,
  • resource references (graphics, tables, charts, etc.).

CSS is also the name of markup language used to create CSS files. CSS markup was designed to enable separation of website content and presentation. This separation makes modifying presentation characteristics of websites easier and more flexible without affecting the content. CSS files also allows websites to be rendered differently depending on the device it has been accessed from (be it a mobile device, desktop PC, etc.) for a much better user-experience.

Can I edit CSS files?

CSS files store data in text format and thus can be easily edited using a text editor. However, it is recommended that CSS files be edited using dedicated tools to avoid potential errors. Such tools automatically highlight keywords, correct syntax errors, and offer autocomplete features.

Programs which support CSS file extension

The following list contains programs grouped by 4 operating systems that support CSS files. Files with CSS suffix can be copied to any mobile device or system platform, but it may not be possible to open them properly on target system.

Updated: 10/06/2022

How to open file with CSS extension?

Problems with accessing CSS may be due to various reasons. Fortunately, most common problems with CSS files can be solved without in-depth IT knowledge, and most importantly, in a matter of minutes. The following is a list of guidelines that will help you identify and solve file-related problems.

Step 1. Install Adobe Dreamweaver software

Install software to open CSS file Problems with opening and working with CSS files are most probably having to do with no proper software compatible with CSS files being present on your machine. The most obvious solution is to download and install Adobe Dreamweaver or one to the listed programs: Adobe ColdFusion, WeBuilder, Microsoft Visual Studio. On the top of the page a list that contains all programs grouped based on operating systems supported can be found. One of the most risk-free method of downloading software is using links provided by official distributors. Visit Adobe Dreamweaver website and download the installer.

Step 2. Check the version of Adobe Dreamweaver and update if needed

Update software that support file extension CSSYou still cannot access CSS files although Adobe Dreamweaver is installed on your system? Make sure that the software is up to date. It may also happen that software creators by updating their applications add compatibility with other, newer file formats. The reason that Adobe Dreamweaver cannot handle files with CSS may be that the software is outdated. All of the file formats that were handled just fine by the previous versions of given program should be also possible to open using Adobe Dreamweaver.

Step 3. Set the default application to open CSS files to Adobe Dreamweaver

After installing Adobe Dreamweaver (the most recent version) make sure that it is set as the default application to open CSS files. The method is quite simple and varies little across operating systems.

Associate software with CSS file on Windows

The procedure to change the default program in Windows

  • Clicking the CSS with right mouse button will bring a menu from which you should select the Open with option
  • Next, select the Choose another app option and then using More apps open the list of available applications
  • The last step is to select Look for another app on this PC option supply the directory path to the folder where Adobe Dreamweaver is installed. Now all that is left is to confirm your choice by selecting Always use this app to open CSS files and clicking OK.
Associate software with CSS file on Mac

The procedure to change the default program in Mac OS

  • From the drop-down menu, accessed by clicking the file with CSS extension, select Information
  • Open the Open with section by clicking its name
  • From the list choose the appropriate program and confirm by clicking Change for all....
  • Finally, a This change will be applied to all files with CSS extension message should pop-up. Click Continue button in order to confirm your choice.

Step 4. Verify that the CSS is not faulty

Should the problem still occur after following steps 1-3, check if the CSS file is valid. It is probable that the file is corrupted and thus cannot be accessed.

Check CSS file for viruses
1. Check the CSS file for viruses or malware

If the CSS is indeed infected, it is possible that the malware is blocking it from opening. It is advised to scan the system for viruses and malware as soon as possible or use an online antivirus scanner. CSS file is infected with malware? Follow the steps suggested by your antivirus software.

2. Check whether the file is corrupted or damaged

If you obtained the problematic CSS file from a third party, ask them to supply you with another copy. The file might have been copied erroneously and the data lost integrity, which precludes from accessing the file. It could happen the the download process of file with CSS extension was interrupted and the file data is defective. Download the file again from the same source.

3. Ensure that you have appropriate access rights

There is a possibility that the file in question can only be accessed by users with sufficient system privileges. Log in using an administrative account and see If this solves the problem.

4. Check whether your system can handle Adobe Dreamweaver

The operating systems may note enough free resources to run the application that support CSS files. Close all running programs and try opening the CSS file.

5. Check if you have the latest updates to the operating system and drivers

Up-to-date system and drivers not only makes your computer more secure, but also may solve problems with Cascading Style Sheet file. It may be the case that the CSS files work properly with updated software that addresses some system bugs.

Do you want to help?

If you have additional information about the CSS file, we will be grateful if you share it with our users. To do this, use the form here and send us your information on CSS file.

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