How To Add CSS

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How To Add CSS

How to Add CSS

When a browser reads a style sheet, it will format the HTML document according to the information in the style sheet.

There are three ways of inserting a style sheet:

External CSS - link to an external .css file
Internal CSS - use the <style> element in the head section
Inline CSS - use the style attribute on HTML elements

External CSS

With an external style sheet, you can change the look of an entire website by changing just one file!

Each HTML page must include a reference to the external style sheet file inside the <link> element, inside the head section.

Example

External styles are defined within the <link> element, inside the <head> section of an HTML page:

<!DOCTYPE html>
<html>
<head>
<link rel="stylesheet" href="mystyle.css">
</head>
<body>

<h1>This is a heading</h1>
<p>This is a paragraph.</p>

</body>
</html>

Try it Yourself »

An external style sheet can be written in any text editor, and must be saved with a .css extension.

The external .css file should not contain any HTML tags.

Here is how the "mystyle.css" file looks:

"mystyle.css"

body {
  background-color: lightblue;
}

h1 {
  color: navy;
  margin-left: 20px;
}

Note: Do not add a space between the property value (20) and the unit (px):
Incorrect (space): margin-left: 20 px;
Correct (no space): margin-left: 20px;

Video: How to add CSS to HTML

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CSS 12-Column Grid Layout

Cavalry发布主题在教程

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- 11分钟前11分钟
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CSS Grid Layout CSS Grid Layout Module The Grid Layout Module offers a grid-based layout system, with rows and columns. The Grid Layout Module allows developers to easily create complex web layouts. The Grid Layout Module makes it easy to design a responsive layout structure, without using float or positioning. My Header Link 1 Link 2 Link 3 Lorem IpsumLorem ipsum odor amet, consectetuer adipiscing elit. Ridiculus sit nisl laoreet facilisis aliquet. Potenti dignissim litora eget montes rhoncus sapien neque urna. Cursus libero sapien integer magnis ligula lobortis quam ut. Footer Try it Yourself » Grid vs. Flexbox CSS Grid is used for two-dimensional layout, with rows AND columns. CSS Flexbox is used for one-dimensional layout, with rows OR columns. CSS Grid Components A grid always consists of: A Grid Container - The parent (container) element, where the display property is set to grid or inline-grid One or more Grid Items - The direct children of the grid container automatically becomes grid items A Grid Container with Five Grid Items The element below represents a grid container (the blue area) with five grid items. 1 2 3 4 5 Example A grid container with five grid items: <html> <head> <style> .container { display: grid; grid-template-columns: auto auto auto; background-color: dodgerblue; padding: 10px; } .container div { background-color: #f1f1f1; border: 1px solid black; padding: 10px; font-size: 30px; text-align: center; } </style> </head> <body> <div class="container"> <div>1</div> <div>2</div> <div>3</div> <div>4</div> <div>5</div> </div> </body> </html> Try it Yourself » Note: You will learn more about grid containers and grid items in the next chapters. All CSS Grid Properties Property Description align-content Vertically aligns the whole grid inside the container (when total grid size is smaller than container) align-items Specifies the default alignment for items inside a flexbox or grid container align-self Aligns the content for a specific grid item along the column axis display Specifies the display behavior (the type of rendering box) of an element column-gap Specifies the gap between the columns gap A shorthand property for the row-gap and the column-gap properties grid A shorthand property for the grid-template-rows, grid-template-columns, grid-template-areas, grid-auto-rows, grid-auto-columns, and the grid-auto-flow properties grid-area Either specifies a name for the grid item, or this property is a shorthand property for the grid-row-start, grid-column-start, grid-row-end, and grid-column-end properties grid-auto-columns Specifies a default column size grid-auto-flow Specifies how auto-placed items are inserted in the grid grid-auto-rows Specifies a default row size grid-column A shorthand property for the grid-column-start and the grid-column-end properties grid-column-end Specifies where to end the grid item grid-column-start Specifies where to start the grid item grid-row A shorthand property for the grid-row-start and the grid-row-end properties grid-row-end Specifies where to end the grid item grid-row-start Specifies where to start the grid item grid-template A shorthand property for the grid-template-rows, grid-template-columns and grid-areas properties grid-template-areas Specifies how to display columns and rows, using named grid items grid-template-columns Specifies the size of the columns, and how many columns in a grid layout grid-template-rows Specifies the size of the rows in a grid layout justify-content Horizontally aligns the whole grid inside the container (when total grid size is smaller than container) justify-self Aligns the content for a specific grid item along the row axis place-self A shorthand property for the align-self and the justify-self properties place-content A shorthand property for the align-content and the justify-content properties row-gap Specifies the gap between the grid rows ★ +1 Sign in to track progress
- 11分钟前11分钟
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CSS Responsive Flexbox
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CSS Responsive Flexbox Responsive Flexbox You learned from the CSS Media Queries chapter that you can use media queries to create different layouts for different screen sizes and devices. For example, if you want to create a three-column layout for large screen sizes, and a one-column layout for small screen sizes (such as phones), you can change the flex-direction from row to column at a specific breakpoint (600px in the example below): 1 2 3 Resize the browser window to see the effect. Example .flex-container { display: flex; flex-direction: row; } .flex-item { background-color: #f1f1f1; padding: 10px; font-size: 30px; text-align: center; width: 100%; } /* Make a one column-layout instead of three-column layout */ @media (max-width: 600px) { .flex-container { flex-direction: column; } } Try it Yourself » Another way is to change the percentage of the flex property of the flex items to create different layouts for different screen sizes. Note that we also have to include flex-wrap: wrap; on the flex container for this example to work: Example .flex-container { display: flex; flex-wrap: wrap; } .flex-item { background-color: #f1f1f1; padding: 10px; text-align: center; font-size: 30px; flex: 33.3%; } /* Make a one column-layout instead of a three-column layout */ @media (max-width: 600px) { .flex-item { flex: 100%; } } Try it Yourself » Responsive Image Gallery using Flexbox Here, we use media queries together with flexbox to create a responsive image gallery: Try it Yourself » Responsive Website using Flexbox Use flexbox to create a responsive website, containing a flexible navigation bar and flexible content: Try it Yourself » ★ +1 Sign in to track progress
- 11分钟前11分钟
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How To Add CSS

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How To Add CSS

How to Add CSS

External CSS

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"mystyle.css"

Video: How to add CSS to HTML

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