Once familiar with HTML, website developers fall into two main categories. One part believes that using HTML on a website you can create everything or almost everything, while the other understands that, in general, markup tools are not enough to design web documents. Indeed, HTML is only the first stage in the process of learning how to create websites. The next step is to learn styles or CSS (Cascading Style Sheets).

Styles are a set of parameters that control the appearance and position of elements on a web page. To make it clear what we're talking about, let's look at Fig. 1.1.

Rice. 1.1. Web page created only in HTML

This is a regular web page, designed without any frills. The same document, but with the addition of styles, takes on a completely different look (Fig. 1.2).

Rice. 1.2. Web page created with HTML and CSS

The change is dramatic, so let's look at the code to understand what the difference is (example 1.1).

Example 1.1. Document source code

HTML5 CSS 2.1 IE Cr Op Sa Fx

Flexagon

A flexagon is a paper figure that has three or more sides. At first it seems that this is impossible, but remember the Mobius strip, it has only one side, unlike a sheet of paper, and, nevertheless, is real. Flexagon is also real, which is easy to make and glue at home. It looks like a two-sided hexagon, but bend it in a special way and we see a third side. It is easy to make sure that we are dealing with exactly three sides if we paint them in different colors. By bending the flexagon, we will observe all its surfaces in turn.

The HTML code itself has not undergone any changes and the only addition is the line . It links to an external styling file called style.css. The contents of this file are shown in Example 1.2.

Example 1.2. Contents of the style.css file

Body ( font-family: Arial, Verdana, sans-serif; /* Font family */ font-size: 11pt; /* Body font size in points */ background-color: #f0f0f0; /* Web page background color * / color: #333; /* Body text color */ ) h1 ( color: #a52a2a; /* Header color */ font-size: 24pt; /* Font size in points */ font-family: Georgia, Times, serif ; /* Font family */ font-weight: normal; /* Normal text weight */ ) p ( text-align: justify; /* Width alignment */ margin-left: 60px; /* Left margin in pixels */ margin-right: 10px; /* Right margin in pixels */ border-left: 1px solid #999; /* Left line parameters */ border-bottom: 1px solid #999; /* Bottom line parameters */ padding-left: 10px; /* Indent from the line on the left to the text */ padding-bottom: 10px; /* Indent from the line below to the text */ )

The style.css file describes all the design parameters of such tags as ,

And

Note that the tags themselves are written as usual in the HTML code.

Since the stylesheet file can be referenced from any web document, this ultimately reduces the amount of duplicate data. And thanks to the separation of code and design, the flexibility of managing the type of document and the speed of working on the site increases.

CSS is its own language that is the same as HTML in only some respects, such as the way it defines color.

Style Types

There are several types of styles that can be applied together to one document. These are browser style, author style, and user style.

Browser style

The default design that is applied to elements of a web page by the browser. This design can be seen in the case of “bare” HTML, when no styles are added to the document. For example, the page title generated by the tag

, appears in a 24-point serif font in most browsers.

Author's style

A style that is added to a document by its developer. Example 1.2 shows one of the possible ways author's style connections.

User style

This is a style that a site user can enable through their browser settings. This style has higher priority and overrides the original design of the document. In Internet Explorer, connecting the user's style is done through the menu Tools > Internet Options > Appearance Button, as shown in Fig. 1.3.

Rice. 1.3. Connecting user style in Internet Explorer browser

In the Opera browser, a similar action occurs through the command Tools > General Settings > Advanced Tab > Content > Style Options Button(Fig. 1.4).

Rice. 1.4. Connecting the user style in the Opera browser

These types of styles can co-exist comfortably with each other as long as they don't try to change the appearance of one element. If there is a conflict, the user's style takes precedence first, then the author's style, and last comes the browser's style.

Questions to check

1. You need to set the title color to green. What style property is suitable for this purpose?

1. font-color
2. color
3. font-family
4. font-size

2. What is style?

1. A way to shorten HTML code by transferring part of the data to another file.
2. Hyper Markup Language text documents.
3. A set of rules for formatting web page elements.
4. A method for converting text documents into HTML.
5. A technology that represents various techniques for laying out HTML code.

3. What does the abbreviation CSS stand for?

1. Colorful Style Sheets
2. Cascading Style Sheets
3. Computer Style Sheets
4. Creative Style Sheets
5. Common Style Sheets

Answers

2. A set of rules for formatting web page elements.

We hope we helped you resolve your CSS file issue. If you don't know where you can download an application from our list, click on the link (this is the name of the program) - you will find more detailed information regarding where to download a secure installation version of the required application.

What else could cause problems?

There may be more reasons why you cannot open a CSS file (not just the lack of a corresponding application).
Firstly- The CSS file may be incorrectly linked (incompatible) with the installed application to serve it. In this case, you need to change this connection yourself. To do this, right-click on the CSS file you want to edit, click the option "To open with" and then select the program you installed from the list. After this action, problems with opening the CSS file should completely disappear.
Secondly- the file you want to open may simply be damaged. In this case, it would be best to find a new version of it, or download it again from the same source (perhaps for some reason in the previous session the download of the CSS file did not finish and it could not be opened correctly).

Do you want to help?

If you have Additional Information about the CSS file extension, we will be grateful if you share it with users of our site. Use the form below and send us your CSS file information.

A CSS file is a cascading style sheet and is often used in web page design. The main purpose of a CSS file is to set the color, font and other positions of individual blocks located on a web page.
This file format was developed to separate the description of the logical structure of an HTML web page on the Internet from the description itself appearance such a CSS page.

Cascading tables require connections to web documents, so style sheets can be connected to required document, the tag is used for this , located between tags And, it looks like this: " ".

Before the advent of the CSS file extension, web documents were designed only using HTML elements. After the developers introduced a file with the CSS extension, it became possible to comfortably use a single design style for most of these documents; in addition, this type of file facilitates quick changes in such design.

You should know that you can open a file with a CSS extension as simple as text file. Quite often, in order to open a CSS file, they use Microsoft Visual Studio and Adobe Dreamweaver utilities. Cascading style sheets with the .css extension can also be opened in various browsers, such as Mozilla Firefox, Opera, Google Chrome and Internet Explorer. To run the .css file within a text editor, you can use applications like Microsoft Word or PSPad editor within the Windows system, and on the Mac OS platform - Apple TextEdit.
The CSS style file is distributed throughout the world for providing convenient design options for website pages.

If you have installed on your computer antivirus program Can scan all files on your computer, as well as each file individually. You can scan any file by right-clicking on the file and selecting the appropriate option to scan the file for viruses.

For example, in this figure it is highlighted my-file.css file, then you need to right-click on this file and select the option in the file menu "scan with AVG". When you select this option, AVG Antivirus will open and scan the file for viruses.

Sometimes an error may occur as a result incorrect software installation, which may be due to a problem encountered during the installation process. This may interfere with your operating system link your CSS file to the correct application tool, influencing the so-called "file extension associations".

Sometimes simple reinstalling Stats+ Datafile may solve your problem by properly linking the CSS to the Stats+ Datafile. In other cases, problems with file associations may result from bad software programming developer and you may need to contact the developer for further assistance.

Advice: Try updating your Stats+ Datafile to the latest version to ensure you have the latest patches and updates.

This may seem too obvious, but often The CSS file itself may be causing the problem.. If you received a file via an email attachment or downloaded it from a website and the download process was interrupted (such as a power outage or other reason), the file may become damaged. If possible, try getting a new copy of the CSS file and try opening it again.

Carefully: A damaged file can cause collateral damage to previous or existing malware on your PC, so it is important to keep your computer up-to-date with an up-to-date antivirus.

If your CSS file related to the hardware on your computer to open the file you may need update device drivers associated with this equipment.

This problem usually associated with media file types, which depend on successfully opening the hardware inside the computer, e.g. sound card or video card. For example, if you are trying to open an audio file but cannot open it, you may need to update sound card drivers.

Advice: If when you try to open a CSS file you get .SYS file error message, the problem could probably be associated with corrupted or outdated device drivers that need to be updated. This process can be made easier by using driver update software such as DriverDoc.

If the steps do not solve the problem and you are still having problems opening CSS files, this may be due to lack of available system resources. Some versions of CSS files may require a significant amount of resources (e.g. memory/RAM, processing power) to properly open on your computer. This problem is quite common if you are using fairly old computer hardware and at the same time a much newer operating system.

This problem can occur when the computer is having trouble keeping up with a task because the operating system (and other services running in the background) may consume too many resources to open the CSS file. Try closing all applications on your PC before opening Stats+ Datafile. Freeing up all available resources on your computer will provide the best conditions for attempting to open a CSS file.

If you completed all the steps described above and your CSS file still won't open, you may need to run equipment update. In most cases, even when using older versions of hardware, the processing power can still be more than sufficient for most user applications (unless you're doing a lot of CPU-intensive work such as 3D rendering, financial/scientific modeling, or intensive multimedia work). Thus, it is likely that your computer does not have enough memory(commonly called "RAM" or random access memory) to perform the task of opening a file.

If our system cannot cope with the .CSS extension and all automatic and semi-automatic methods of teaching it this art have failed, we are left with manual editing of the Windows registry. This registry stores all information relating to our work. operating system, including connecting file extensions to programs to serve them. Team REGEDIT inscribed in the window “search for programs and files” or "launch in the case of older versions of the operating system, it gives us access to the registry of our operating system. All operations performed in the registry (even not very complex ones regarding the .CSS file extension) have a significant impact on the operation of our system, so before making any modifications, you should make sure that a copy of the current registry is made. The section we are interested in is the key HKEY_CLASSES_ROOT. The following instructions show, step by step, how to modify the registry, specifically the registry entry containing information about the .CSS file.

Step by step

• Click “start” button
• In the “find programs and files” window (in older versions of Windows this is the “Run” window), enter the command “regedit” and then confirm the operation with the “ENTER” key. This operation will launch the system registry editor. This tool will allow you not only to view existing records, but also to modify, add or delete them manually. Due to the fact that the Windows registry is key to its operation, all operations carried out on it should be performed judiciously and consciously. Carelessly removing or modifying an inappropriate key may permanently damage the operating system.
• Using the ctr+F key combination or the Edit menu and the “Find” option, find the .CSS extension you are interested in by entering it in the search engine window. Confirm by pressing OK or using the ENTER key.
• Backup copy. It is extremely important to create a backup copy of the registry before making any changes to it. Every change has an impact on the operation of our computer. In extreme cases, erroneous modification of the registry may result in the system being unable to restart.
• The value you are interested in regarding the extension can be manually edited by changing the keys assigned to the found extension.CSS. In this place, you can also independently create the desired entry with the extension a.CSS if it is not in the registry. All available options are located in the handy menu (right mouse button) or in the "Edit" menu after placing the cursor in the appropriate place on the screen.
• After you finish editing the entry for the .CSS extension, close the system registry. The introduced changes will take effect after restarting the operating system.