How to set the style of id element in css

In web design, CSS is a very important technology. Through CSS, we can style elements in HTML pages, such as font size, color, background, etc. We have introduced the class style setting in CSS before. This article will discuss the id style setting in CSS. In HTML, each element can be uniquely identified by the attribute id. By setting the id style, we can set the precise style of the element. Let us learn about it together.

1. Basic syntax

The syntax for setting the id style is very simple. Just use # in CSS and add the id name of the element, for example:

#element-id {
    property: value;
}

Among them, # represents setting the id style, followed by the id name of the element (element-id), and the corresponding style attributes and values ​​can be set in curly brackets.

2. Specific style settings

In id style settings, the style attributes and values ​​we can use are basically the same as class style settings. Let’s give an example below:

2.1 Font style setting

The font style of the element can be set through the font attribute. The specific syntax is as follows:

#element-id {
    font-size: 16px; /* 设置字体大小为16px*/
    font-weight: bold; /* 设置字体加粗 */
    font-style: italic; /* 设置字体斜体 */
    font-family: Arial, sans-serif; /* 设置字体类型 */
}

2.2 Background style setting

The background style of the element can be set through The background attribute is set. The specific syntax is as follows:

#element-id {
    background-color: #f9f9f9; /* 设置背景颜色 */
    background-image: url('bg.jpg'); /* 设置背景图片 */
    background-repeat: no-repeat; /* 设置背景图片不平铺 */
    background-position: center center; /* 设置背景图片居中 */
}

2.3 Border style setting

Setting the border style of the element can be set through the border attribute. The specific syntax is as follows:

#element-id {
    border: 1px solid #999; /* 设置边框宽度为1px，样式为实线，颜色为#999 */
    border-radius: 5px; /* 设置圆角边框 */
    border-top: none; /* 取消上边框 */
    border-bottom: 2px dotted #ccc; /* 设置下边框为2px虚线 */
}

2.4 Box model style setting

Setting the box model style of an element can be set through the padding and margin attributes. The specific syntax is as follows:

#element-id {
    padding: 10px; /* 设置元素内边距为10px */
    margin: 20px; /* 设置元素外边距为20px */
}

3. Notes

When using the id style When setting, you need to pay attention to the following points:

1. The id name is unique in the entire HTML page and cannot be named repeatedly.
2. If multiple ids with the same name appear in a single page, the browser will only render the id style that appears first.
3. It is not recommended to abuse the id style. Class style settings should be used first to avoid redundant and confusing page styles.

4. Conclusion

The id style and class style in CSS are the two most commonly used styles in web design. They can set specific styles for label elements to make the page More beautiful and standardized. When setting the id style, we need to pay attention to the uniqueness of the id name and be careful not to abuse the id style. I hope this article can help readers understand the id style setting of CSS.

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