How to use CSS to implement a flowchart

Flow chart refers to a process that displays a process through graphics and arrows. It can express each link of the process more intuitively and is very practical. In modern web development, we often need to use various styles to beautify flow charts, so this article will introduce some basic CSS styles and how to use CSS to implement a flow chart.

First, let’s look at a simple flow chart~

The flow chart in the picture consists of 3 steps: start, process and end. We can use CSS to style these steps to make the information easier for people to understand.

Next, we need to define some CSS styles to beautify our flow chart.

1. Basic style

We can set the same background color, border and font size for each step:

.step {
  background-color: #fff;
  border: 1px solid #333;
  font-size: 14px;
  padding: 10px;
  text-align: center;
}

In the above code, we used background-color to set the background color, border to set the border, font-size to set the font size, padding to set the space between text and border For spacing, use text-align to set text center alignment.

These basic styles can be used to unify all steps throughout the diagram.

2. Styles of starting points and ending points

For starting points and ending points, we can use special styles to make distinctions to assist readers in understanding, for example:

.start {
  background-color: #0f0;
}

.end {
  background-color: #f00;
}

In the above style, we use background-color to set the background color, and use backgrounds of different colors to distinguish the starting and ending points.

3. Arrow style

In the flow chart, arrows are the key to connecting steps. We can also use styles for arrows:

.arrow {
  border-top: 1px solid #ccc;
  height: 20px;
  position: relative;
  margin-top: -20px;
}

.arrow::before {
  border-left: 1px solid #ccc;
  border-top: 1px solid #ccc;
  content: "";
  height: 10px;
  left: -7px;
  position: absolute;
  top: 10px;
  transform: rotate(-45deg);
  width: 10px;
}

In the above code, we used Two key styles: .arrow and .arrow::before.

.arrow style is used to set the basic style of the arrow, including: using border-top to set the color and thickness of the arrow, and specify the height of the arrow, use The position property allows the arrow to be positioned. Set margin-top to a negative number to prevent the arrow from overlapping the text. The .arrow::before style is used to set the shape of the arrow, including: using border-left and border-top to specify the left and top colors respectively. and thickness, use the content attribute to an empty string to display it as a box, use the position attribute to position the arrow, take the top value to set the position of the arrow, use transform property to rotate it to 45 degrees.

With the above basic CSS styles, we can then implement a complete flow chart through HTML and CSS.

<div>
  <div>开始</div>
  <div></div>
  <div>流程1</div>
  <div></div>
  <div>流程2</div>
  <div></div>
  <div>流程3</div>
  <div></div>
  <div>结束</div>
</div>

In the above HTML code, we use the div tag to define the text of each step in the flow chart, and the .arrow style to define the arrow. In the implementation, you need to use margin-top to adjust the position of the arrow, and remove the .arrow style in the last step, otherwise there will be an empty arrow. Use start and end to indicate the starting point and end point respectively.

Of course, in addition to the above basic CSS styles, we can also define more advanced styles as needed, such as adding animation effects to make the page more vivid. When developing flowcharts, remember to pay attention to clarity and legibility to ensure that information is clearly presented to users for optimal use.

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