How to use external css files in html

But since css is the only stylesheet language used on the web, it is not only optional, but it is even a best practice not to include it. The media attribute is not visible in the example.

It's an optional attribute that you can use to specify when to import a certain stylesheet. This can be useful in case you want to separate the styles for different devices and screen sizes in different files.

You would need to import each CSS file with its own link element. You can check out these articles or other sources on media queries to learn more about what you can write as an attribute value:. The external style sheet can be written in any text editor. The file must not contain any HTML code, and must be saved with a. Tip: With an external style sheet, you can change the look of an entire web site, by changing one file!

Here, we will demonstrate some commonly used CSS properties. You will learn more about them later. The CSS padding property defines a padding space between the text and the border.

The CSS margin property defines a margin space outside the border. To use inline styles, add the style attribute to the relevant element. The style attribute can contain any CSS property. Tip: An inline style loses many of the advantages of a style sheet by mixing content with presentation. Use this method sparingly. If some properties have been defined for the same selector element in different style sheets, the value from the last read style sheet will be used.

All the styles in a page will "cascade" into a new "virtual" style sheet by the following rules, where number one has the highest priority:. So, an inline style has the highest priority, and will override external and internal styles and browser defaults. The link tag allows to define a link between a document and an external resource [2].

In our case, the external resource will be the CSS file. On the rel attribute of the link tag, we need to specify the relation between the HTML document and the linked document [2].

Finally, in the href attribute, we need to specify the URL of the external resource [4]. We will simply use the name of the file, which will also need to be the name of the route in the Arduino code. Then, in the body section, we will have the elements that will compose our simple dashboard.

Nonetheless, as a brief summary, we will implement both measurement displays with some HTML divs. Each display will show in bigger letters the current value for that measurement and, in lower letters below, the type of measurement.

Note however that the sizes of the letters will be specified in the CSS styles, so here we will only have the content. If you experience problems with other characters while developing HTML code that will be transferred to the ESP32 file system, please check this tool in order to get the escaped values, so you can use them instead.

We are specifying the class names of the HTML elements, so the correct CSS styles are applied accordingly to what will be defined in the. We will also only take a brief look at the CSS code that we will be used. As an initial note, please take in consideration that it is a common good practice to keep the properties inside classes in alphabetical order.