Learn to style HTML using CSS Learn web development MDN

If set to 0, it does not add any extra space for the item when calculating the layout. You can override this property using order on each separate what does css do for a web page item. This is a property you set on the item, not the container. You can make an item appear before all the others by setting a negative value.

For example you might pass a pixel value to a position property, or a rem value to a color property. If a variable is assigned to a property which https://deveducation.com/ does not accept the variable value, it’s considered invalid. Adding variables to a selector makes them available to all the children of it.


The font property lets you apply different font properties in a single one, reducing the clutter. Background-clip lets you determine the area used by the background image, or color. The default value is border-box, which extends up to the border outer edge. One of the things you’ll use every day in CSS are units.

css definition

The class selector selects HTML elements with a specific class attribute. If set to auto, it sizes an item according to its width or height, and adds extra space based on the flex-grow property. The values assigned to the width and height properties are respected, if you set them, along with margin and padding. Those 3 properties mentioned, border-width, border-style and border-color can be set using the shorthand property border. Even if you just have one CSS file loaded by your page, there is other CSS that is going to be part of the process. Browsers come with a default set of rules, all different between browsers.

Internal or embedded CSS

Check out this Codepen to have a more useful example, which I forked from a Pen originally created by Martin Michálek. You can change this behavior using justify-content to change the horizontal alignment, and align-items to change the vertical alignment. Let’s dive into flexbox and become a master of it in a very short time. The following example divides a grid into 3 columns with the same width, 1/3 of the available space each. The element with class .my-second-div will be displayed, and behind it .my-first-div. The higher the z-index value, the more an element is positioned nearer to the user.

  • In the past we used to float the sidebar to the left, for example, to show it on the left side of the screen and added some margin to the main content.
  • Presenting a document to a user means converting it into a form usable by your audience.
  • If you don’t set a color, the border by default is colored using the color of the text in the element.

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