Detailed introduction to CSS background rotation properties

CSS is one of the common front-end technologies now, and it is also the first step for many people to learn front-end technology. CSS background rotation is also an important attribute in CSS, which can make web pages appear more vivid and three-dimensional. Next, we will introduce the CSS background rotation property in detail.

1. What is CSS background rotation?

CSS background rotation refers to rotating the background through the transform attribute in CSS. When we set the rotation angle and rotation center point, the background image can be rotated according to the set parameters to achieve the desired effect.

2. How to use CSS background rotation

The use of CSS background rotation is very simple. You only need to set the background-image and transform attributes and set the corresponding values.

The sample code is as follows:

div{
    background-image: url(图片地址);
    transform: rotate(45deg);
}

In the above code, we make use of the "div" element and add the background-image and transform attributes to it. Among them, the background-image attribute specifies the address of the background image to be used, and the transform attribute sets the angle of rotation.

3. Common attribute values ​​​​of CSS background rotation

In CSS, we can adjust the rotation effect of the CSS background by modifying the value of the transform attribute. The following are some common CSS background rotation attribute values:

1.rotate(deg): Rotate deg degree angle.

2.rotateX(deg): Rotate the entire element along the X-axis by deg degrees.

3.rotateY(deg): Rotate the entire element along the Y axis by deg degrees.

4.rotateZ(deg): Rotate the entire element along the Z axis by deg degrees.

5.rotate3d(x,y,z,deg): Rotate the entire element in 3D by deg degrees.

4. Example application of CSS background rotation

1. Simple background rotation animation example

In the following example, we set a "div" element and Use CSS background rotation to implement a simple background rotation animation effect. The code is as follows:

div{
    width: 200px;
    height: 200px;
    background-image: url(图片地址);
    animation: rotate 3s ease-in-out infinite;
}

@keyframes rotate{
    0%{
        transform: rotate(0deg);
    }
    100%{
        transform: rotate(360deg);
    }
}

In this code, we added the width, height and background-image attributes to the "div" element, and set its width, height and background image respectively. In terms of animation effects, we used the @keyframes keyword in CSS3 to create a background rotation animation called "rotate" to achieve the dynamic effect of web page elements.

2. Use CSS background rotation to realize the "love" picture

Below, we demonstrate an example of using CSS background rotation to realize the "love" picture. The code is as follows:

div{
    width: 150px;
    height: 150px;
    background-image: url(图片地址);
    transform: rotate(-45deg);
    position: relative;
}

div:after{
    content: "";
    width: 150px;
    height: 150px;
    position: absolute;
    top: 0;
    left: 75px;
    background-image: url(图片地址);
    transform: rotate(45deg);
}

In the above code, we set the background-image attribute for the parent "div" element and the child "div:after" element, and use the transform attribute to rotate them accordingly. This achieves the effect of a "love" picture. At the same time, due to the setting of the positioning position and rotation angle of the child "div:after" element, we also realized the cropping of the background image of the parent "div" element.

Summary

The above is a detailed introduction to the CSS background rotation property. By studying this attribute, we can have a deeper understanding of the transform attribute in CSS technology, and can use CSS technology more skillfully to create more vivid and three-dimensional web page elements.

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