How to modify css attribute style? Introduction to common methods

<p> In web design, CSS style sheets are an inevitable part. Through CSS style sheets, we can modify the styles of web page elements to beautify the page and improve user experience. This article will introduce how to modify CSS properties.

<p>1. Selector

<p>First of all, before modifying CSS properties, we need to understand the selector. In CSS style sheets, selectors are used to select elements to be modified. Commonly used selectors include:

1. Element selector: used to select all elements of the same element type. For example: p, h1, div, etc.
2. Class selector: used to select elements with the same class name. Begins with . (dot), for example: .class.
3. ID selector: used to select elements with the same ID. Start with # (pound sign), for example: #id.
4. Attribute selector: used to select elements with the same attribute value. For example: [type='radio'].
5. Descendant selector: used to select child elements contained within a specific element. For example: ulli.

<p>2. Modify CSS properties

<p>After selecting the elements to be modified, we can start modifying CSS properties.

1. Modify text style

<p>For modification of text style, we can set it through the font-family, font-size, color and other attributes in the CSS style sheet. For example:

p {
    font-family: Arial, sans-serif;
    font-size: 16px;
    color: #333;
}

<p>This code will select all <p> elements and set their font to Arial, font size to 16 pixels, and color to dark gray.

2. Modify the background style

<p>The background style of a web page directly affects the overall effect of the page. We can set it through the background-color, background-image and other properties in the CSS style sheet. For example:

body {
    background-color: #f5f5f5;
    background-image: url("bg.jpg");
    background-repeat: repeat-x;
}

<p>This code will set the background color of the page to light gray, the background image to bg.jpg, and tile it horizontally.

3. Modify the box model style

<p>By modifying the box model style, we can control the size, border, padding and other attributes of the element. For example:

div {
    width: 300px;
    height: 200px;
    border: 1px solid #ccc;
    padding: 10px;
}

<p>This code will select all <div> elements and set their width to 300 pixels, height to 200 pixels, and stroke to 1 pixel gray Solid line with 10 pixel padding.

4. Modify the animation style

<p>The animation effect can make the page look more vivid and attract the user's attention. We can set animation effects through the animation property in CSS. For example:

@keyframes fade {
    from {opacity: 0;}
    to {opacity: 1;}
}

div {
    animation: fade 2s;
}

<p>This code will create an animation named fade, which will gradually change from a state of transparency 0 to a state of transparency 1, with a duration of 2 seconds. The <div> element will have this animation effect applied to it.

<p>3. Summary

<p>Through the previous explanation, we have learned about the commonly used selectors and attributes that modify styles in CSS. Of course, there are many other uses of CSS, such as responsive design, layout, etc., which require further learning and mastering. By using CSS flexibly, we can create more beautiful and efficient web pages.

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