css img set image

In the website design process, pictures are an integral part. It can not only beautify the website, but also provide users with more intuitive information, attract their attention, and enhance the readability and interactivity of the website. How to set and adjust the size and position of images in CSS is also very important. Today, we will explain in detail how to set images and optimize designs in CSS.

1. Position attribute

Let us first take a look at how to set the position attribute of the image, that is, the position of the image on the web page. CSS provides the position attribute, which allows us to easily control the position of images on the web page.

Commonly used position attribute values ​​are:

1. static: Default value, indicating that the element exists in the normal document flow and is not affected by top, bottom, left, and right.
2. relative: Indicates that the element is moved relative to its original position. The position of the element can be adjusted by setting top, bottom, left, and right.
3. absolute: Indicates that the element is no longer in the normal document flow and is positioned relative to its parent element. If there is no parent element, it is positioned relative to the entire document.
4. fixed: Indicates that the position of the element is fixed relative to the browser window. The element will stay in its original position regardless of whether the web page is scrolled or not.

When using the position attribute, we can also set the z-index attribute to control the element's layer. Z-index represents the level of the element. The larger the level, the higher the element is. This allows you to control the priority of elements in the web page, so that the elements that need to be highlighted are displayed at the top of the web page.

2. Size attribute

It is also very important to set the size attribute of the image, which can make the image better adapt to different devices and screen sizes.

Commonly used size attributes are:

1. width: Set the width of the element. You can set a specific pixel value or percentage, or set it to auto to let the browser automatically calculate the width.
2. height: Set the height of the element. Similar to the width, you can also set a specific value or percentage, or set it to auto.
3. max-width: Set the maximum width of the element. For example, in responsive design, we often use max-width to control the display size of images to ensure that images can be displayed at appropriate sizes on different devices.
4. max-height: Set the maximum height of the element. It can also be used for image optimization in responsive design.

In addition, you can also use the object-fit attribute to adjust the size and proportion of the image. object-fit represents the relationship between the image and its container. Commonly used attribute values ​​are:

1. fill: The image fills the entire container, and the image is automatically stretched or compressed.
2. contain: Place the entire image in the container. Even if the image is compressed, the original proportion must be maintained to ensure that the image is fully displayed.
3. cover: The image covers the entire container, and the image is cropped to fit the container.
4. none: Keep the original image size without any scaling.

3. Borders and rounded corners

Borders and rounded corners are also important attributes for optimizing image display. In CSS, we can use the border attribute to set the border of an element. Commonly used attribute values ​​are:

1. border-width: Set the width of the border. Specific pixel values ​​or percentages can be set.
2. border-style: Set the style of the border. Commonly used attribute values ​​include solid, dashed, dotted, etc.
3. border-color: Set the color of the border. You can use a specified color name or a hexadecimal value.

In addition to the border, we can also use the border-radius attribute to set the rounded corners of the element. This property can make the corners of an element more rounded, enhancing its beauty and readability.

4. Background attributes

Background is an important part of web design, and CSS provides a wealth of background attributes that allow us to freely control the style and effect of the web page background.

Commonly used background attributes are:

1. background-color: Set the color of the background.
2. background-image: Set the path of the background image, you can use local images or network images.
3. background-repeat: Set the repeat mode of the background image. Commonly used attribute values ​​include no-repeat, repeat-x, repeat-y, etc.
4. background-position: Set the position attribute of the background image.
5. background-size: Set the size of the background image. You can use auto, cover, contain and other attribute values.

To sum up, CSS provides a variety of ways to control the position, size, borders and background of images on web pages. When designing a website, we can choose appropriate attribute values ​​based on specific needs and effects to optimize the display of images and provide users with a better visual experience.

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