How to achieve beyond the scroll bar in css

CSS is a commonly used style design language in front-end development, which can be used to achieve some visual effects on web pages. In web pages, we often encounter situations where there is too much content, causing problems with the page layout. At this time, we can use the overflow property in CSS to solve this problem.

Exceeding the scroll bar means that when the content of an element exceeds the size of its container, the browser will automatically display a scroll bar so that the user can browse all the content. CSS has three overflow properties: overflow-x, overflow-y, and overflow. Among them, the overflow-x attribute controls the scrolling of the element in the horizontal direction beyond the content, the overflow-y attribute controls the scrolling of the element in the vertical direction beyond the content, and the overflow attribute controls whether the element scrolls beyond the content.

When an element needs to exceed the scroll bar, we can add the following code to its style:

overflow: auto;/* 父元素需要设置一个固定高度 */

The above code will automatically generate scroll bars to allow the web page to access more height of the content and width. If we don't want the content to exceed the container, we can use the following code:

overflow: hidden;

This will hide the exceeded content without generating scroll bars. Although the user cannot see all the content, it can also ensure that the content will not Affects page layout.

It is worth noting that if you only want to control scrolling in the vertical or horizontal direction, you should use the overflow-x or overflow-y attributes. For example:

overflow-x: auto; /* 只允许水平方哦的滚动 */
overflow-y: auto; /* 只允许垂直方向的滚动 */

In addition, we can also use the scroll-behavior attribute to control the behavior of the scroll bar. This attribute can be used to change the scrolling method of the browser scroll bar, such as smooth scrolling. Usage example:

scroll-behavior: smooth;

Finally, we need to pay attention to a detail: when an element is set with the overflow scrolling attribute, its parent element needs to set a fixed height, otherwise the content will scroll indefinitely. We can use the max-height or height attribute to set the height of the parent element and ensure that its container size does not exceed the viewport.

The following is a sample CSS code that can add vertical scrolling in a long navigation bar:

.container-nav{
  height: 300px;
  overflow-y: auto;
}

In general, CSS beyond the scroll bar is a very useful feature. It allows us to deal with the problem of too much content on a web page and ensures that the page layout remains clean. Using these properties allows you to easily add scroll bars to your web pages and provide users with a better browsing experience.

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