How to implement up and down scrolling in css

CSS to achieve up and down scrolling

In web design and development, it is a common requirement to achieve the up and down scrolling effect of text. Below we introduce a CSS-based method to achieve scrolling up and down.

Step 1: Define the container

In HTML, we first need to define a container to contain the content that needs to be scrolled. You can use divs as containers or other HTML elements.

Code example:

<div>
  <p>这是需要滚动的内容……</p>
  <p>这也是需要滚动的内容……</p>
  <p>这还是需要滚动的内容……</p>
</div>

Step 2: Set the style

We use CSS to set the basic style of the container, including width, height, border, etc. At the same time, we need to use the overflow: hidden attribute to hide content beyond the scope of the container so that the content can scroll freely within the container.

Code example:

.scroll-container {
  width: 400px;
  height: 200px;
  border: 1px solid #ccc;
  overflow: hidden;
}

Step 3: Implement the scrolling effect

In the container, we need to define an element as a scrolling "window" to display the scrolling content. We can use positioning to place this scrolling window inside the container and set its initial position.

In order to achieve the scrolling effect, we need to use the animation property of CSS to define an animation. In the animation, we can control the position of the scroll window, move it up or down, and set the speed of the scroll.

Code example:

.scroll-container {
  position: relative;
}

.scroll-container p {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  animation: scroll 10s linear infinite;
}

@keyframes scroll {
  0% {
    transform: translateY(0);
  }
  100% {
    transform: translateY(-100%);
  }
}

In the above example, we define the scrolling window as a child element p within the scroll-container element, And place it in the upper left corner of the scroll-container container. Next, we use position: absolute to remove it from the document flow and use top: 0 and left: 0 to place it on top of the container. .

In the animation attribute, we use scroll as the animation name, and set its duration to 10 seconds, and the time function to linear, Represents uniform motion. infinite means the animation continues indefinitely. Next, we define the specific process of animation in @keyframes scroll, where transform: translateY(-100%) means moving up the height of the scroll window to achieve the scrolling effect.

Step 4: Complete code

The above steps are integrated together, and the final complete code is as follows:

<div>
  <p>这是需要滚动的内容……</p>
  <p>这也是需要滚动的内容……</p>
  <p>这还是需要滚动的内容……</p>
</div>

The above are the steps and complete code for scrolling up and down using CSS. The differences are The requirements can be achieved by modifying the styles of the container and scrolling window.

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