How to set html scroll bar

HTML scroll bar settings

In the development of web pages, we often use scroll bars to allow users to browse the page content. The style and behavior of scroll bars can be customized through CSS. This article will introduce how to set scroll bars in HTML and how to style scroll bars.

Set scroll bars in HTML

In HTML, you can use elements such as iframe and div to contain content to display scroll bars. Among them, the iframe element is a tag in HTML specifically used to display other web pages, while the div element is a tag used to separate different content.

Below we will give an example of how to use div elements to display scroll bars. First, we need to add a div element containing content in HTML:

<div id="scrollable-content">
    <!-- 这里放置希望滚动的内容 -->
</div>

Among them, the div element with the id attribute scrollable-content is our scrolling container.

Next, we need to add styles to the div element so that the browser displays scroll bars. In CSS, we can control the scrolling behavior of elements through the overflow attribute. The overflow attribute has the following values:

• visible: default value. The content of an element may extend beyond the element box, but scroll bars will not automatically appear.
• hidden: When the content of an element exceeds the element box, the browser will hide the excess part.
• scroll: When the content of an element exceeds the element box, the browser will display a scroll bar, and the user can use the scroll bar to browse the excess part.
• auto: If the element content exceeds the element box, the browser will display the scroll bar, otherwise it will not be displayed.

We will add the following styles to the scrollable-content element:

#scrollable-content {
    height: 200px; /* 设置元素高度 */
    overflow: auto; /* 显示滚动条 */
}

By setting the height attribute to 200px, we make the height of the scrollable container 200 pixels. Set the overflow attribute to auto, and the browser will automatically display a vertical scroll bar when the content of the scroll container exceeds the height of the container.

Style the scroll bar

In addition to using the default browser scroll bar style, we can also use CSS styles to customize the scroll bar. Different browsers have slightly different style support for scroll bars, but here are some common style settings.

1. Set the scroll bar width and color

We can control the scroll bar width and color by setting the ::-webkit-scrollbar attribute. The following is an example:

::-webkit-scrollbar {
    width: 10px; /* 设置滚动条宽度 */
    height: 10px; /* 设置滚动条高度 */
}

::-webkit-scrollbar-thumb {
    background-color: #cccccc; /* 设置拖动条颜色 */
}

::-webkit-scrollbar-track {
    background-color: #f2f2f2; /* 设置滚动条背景颜色 */
}

In the above style, we use ::-webkit-scrollbar to represent the setting of the scroll bar style. Among them, the -webkit- prefix is ​​used for browsers that support the webkit kernel, such as Chrome, Safari, etc.

We adjust the width and height of the scroll bar by setting the width and height properties. Use the ::-webkit-scrollbar-thumb style to set the color of the drag bar, and use the ::-webkit-scrollbar-thumb style to set the scroll bar background color.

2. Set the scroll bar rounded corners

We can also change the shape of the scroll bar by setting the rounded corner style of the scroll bar. The following is the sample code:

::-webkit-scrollbar {
    width: 10px;
    height: 10px;
    border-radius: 4px; /* 设置圆角 */
}

In the above style, we use the border-radius attribute to set the scroll bar's corner radius to 4 pixels.

Summary

This article introduces how to set scroll bars in HTML and how to style scroll bars. Although different browsers have different support for scroll bar styles, we can use the ::-webkit-scrollbar style to control the scroll bar style of webkit kernel browsers. By using CSS styles, we can make the scroll bar more beautiful and more in line with the design style of the web page.

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