How to Become an Expert CSS Developer

Hello again! If you are reading this article, it means that you want to become a CSS developer. But, I know how hard sometimes it can be to start doing anything. Is it fear, ignorance, or just misunderstanding of basic CSS concepts?

There is some research about such an issue that why many developers are afraid of CSS. Anyone who has worked in the front-end area for a few years knows the phenomenon that HTML and especially CSS are often associated with incomprehension and difficulties.

It remains to be seen whether fear is the driver of this phenomenon – but there are certain misunderstandings about the basic concepts of CSS. This then results in the negative feelings towards the powerful stylesheet language. So let’s take a look at the basic concepts of CSS that will help you to become an expert CSS developer.

The CSS information can come from three sources:

Become an Expert CSS Developer

  1. Browser stylesheet: Every browser has its own CSS rules.
  2. User style sheets: Each user can specify in the browser settings, among other things, which font is preferred, how big the fonts should be and so on. This information overwrites the information from the browser.
  3. Author stylesheets: These are the CSS rules that are integrated within the documents / websites. These details overwrite both the browser and user CSS. The rules from the author or document CSS have the highest priority. The user information has a lower priority.

The order and the importance

The order of the CSS information is important. In the following little example the second rule will be used because the later information overwrites the previous one.

h1, h2, h3 {font-weight: normal; }

h1, h2, h3 {font-weight: bold; }

It is the same in the following example:


<title> Page title </title>

<link rel = “stylesheet” href = “style-1.css” type = “text / css” media = “all” />

<link rel = “stylesheet” href = “style-2.css” type = “text / css” media = “all” />


The information from style-2.css overwrites the rules from style-1.css. However, you can set the priority manually. This works with the keyword!


h1, h2, h3 {font-weight: normal! important; }

h1, h2, h3 {font-weight: bold; }

Although the second rule should actually be applied, the first rule is preferred when using!

The specificity

The CSS rules have a specificity – the more general a rule is defined, the lower its specificity. This becomes clear in the following example:

article {…}

.main article {…}

#wrap .main article {…}

From all the rules above, the third has the strongest specificity and therefore has priority when interpreted by the browser – regardless of the order.


Many also find inheritance in CSS confusing. Some properties inherit values, others do not. For example, the font color or size are inherited, but the information about the inner or outer spacing in the box model is not. However, you can control inheritance. With the inherited value you can force an inheritance and with initial you have the possibility to return to the default value.

Browser support

The fact that browsers do not handle CSS in the same way causes additional headaches for beginners. But don’t give up at this stage of becoming an expert CSS developer. With the help of @supports you can query within CSS whether the browser supports a certain property:

@supports (display: grid) {

div {

display: grid;



If it does not support the property, you can also provide an alternative solution within CSS:

@supports not (display: grid) {

div {

float: right;



These were the basics. If you want to be a little bit more advanced, I’ll give some really worth mentioning tips below.

CSS Background Blends: Transition effects like with Photoshop

Since CSS3 has appeared, it is possible to apply several backgrounds to one element. These background graphics or colors are simply superimposed on one another. If there are transparencies within the backgrounds, they ensure that the underlying background shines through. With the new CSS3 transition effects, there are now more options for combining multiple backgrounds.


First of all, several backgrounds must be created using the “background” property. If several background graphics and / or colors are to be used, they are simply listed one after the other, separated by commas. Then you specify the type of cross-fading using the “background-blend-mode” property.

body {

background: url (“wolken.jpg”), url (“burg.jpg”);

background-blend-mode: multiplay;



Responsive Design: Make your website fit for high-resolution displays

When Apple started equipping its iPhones, iPads and MacBooks with high-resolution displays – the so-called retina displays – a few years ago, this led to a significant improvement in the display quality. Individual pixels can no longer be recognized as such on these displays. Meanwhile, high-resolution displays are no longer a specialty. Current mobile devices in particular are already in the middle class with high resolution. While many apps for mobile devices have long been geared towards high resolution, high-resolution websites can now also be implemented using HTML5, CSS3 and JavaScript – without additional JavaScript libraries.

For historical reasons, 320 pixels have become the standard width for mobile devices. Many mobile websites are geared towards this breadth. High-resolution displays have twice as many or more pixels. So that a website does not appear half as large on these displays, the page is virtually upscaled. This is not a problem with fonts and vector graphics. Bitmap-based formats such as JPEG and PNG files, on the other hand, look fuzzy and pixelated.

As such displays become more common, it is of course becoming increasingly important for web designers and developers to provide web projects in high-resolution quality.

Responsive web design: Create mobile versions of websites with media queries

CSS3 is a topic that still excites and frustrates web designers and developers. Personally, I am very enthusiastic about the possibilities that CSS3 offers us and the problems we can solve with it. At the same time, we are frustrated by the lack of support in Internet Explorer 8.

Where can I learn CSS?

You can learn it by yourself. It is really not very hard to possess, as there are a lot of free online courses that offer a wide range of knowledge. You can also find offline training because almost in every town there is a programming school. Possibilities are literally everywhere, just have a desire for this.

A good thing is to communicate a lot with other developers and intercept their skills, knowledge and experience. Make friends among the CSS community and you will get a lot of various personal advice that you will never hear during the courses.

I really wish you to reach your goal and become a cool and demanded CSS professional. Good luck!

Rootmygalaxy a.k.a RMG was started in 2015 with a solo goal of Helping users with easy How-to guides. Slowly the website started sharing exclusive Leaks and Tech News. In these 5 years, we have been credited by the likes of Forbes, CNBC, Gizmodo, TechCrunch, Engadget, Android Authority, GSM Arena and many others. Want to know more about us? Check out our About Us page or connect with us Via Twitter, Facebook, Youtube or Telegram.

An NIT Rourkela Graduate in CS, Blogger, Android Geek, and a Tennis Fanatic. I have been writing about Android OS for Last 8 years.

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