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CSS: Basic tag styles

By default, all HTML tags have a standard layout. This design is set by browsers, and each browser can set its own style. Because of this, the same layout may appear different, depending on the browser, operating system, and system settings.

For example, the first level header <h1> in browsers has a size of 2em, which means twice the size of the font in the block. This value is not fixed - it can change with system settings, or if the browser developers decide to make it slightly different.

Using the <style> tag, we've learned to change styles for all elements at once, for example:

h1 {
  font-size: 35px;

But this option is convenient only for setting the initial/main values for our web page. Different parts of it may need different header styles for the same level. We'll learn how to solve this problem using CSS selectors and HTML attributes in future lessons. The main thing to remember is that almost all elements have a default style, which can be both a benefit and a nuisance when designing a page


Add a first level heading to the editor and set the font size to 20 pixels. Write the styles in the <style> tag.

The exercise doesn't pass checking. What to do? 😶

If you've reached a deadlock it's time to ask your question in the «Discussions». How ask a question correctly:

  • Be sure to attach the test output, without it it's almost impossible to figure out what went wrong, even if you show your code. It's complicated for developers to execute code in their heads, but having a mistake before their eyes most probably will be helpful.
In my environment the code works, but not here 🤨

Tests are designed so that they test the solution in different ways and against different data. Often the solution works with one kind of input data but doesn't work with others. Check the «Tests» tab to figure this out, you can find hints at the error output.

My code is different from the teacher's one 🤔

It's fine. 🙆 One task in programming can be solved in many different ways. If your code passed all tests, it complies with the task conditions.

In some rare cases, the solution may be adjusted to the tests, but this can be seen immediately.

I've read the lessons but nothing is clear 🙄

It's hard to make educational materials that will suit everyone. We do our best but there is always something to improve. If you see a material that is not clear to you, describe the problem in “Discussions”. It will be great if you'll write unclear points in the question form. Usually, we need a few days for corrections.

By the way, you can participate in courses improvement. There is a link below to the lessons course code which you can edit right in your browser.

If you got stuck and don't know what to do, you can ask a question in our community