CSS Triangle & Arrow Generator

It is a generator to create a triangle with only HTML and CSS.
Arrows are automatically generated by using CSS border. All directions of 360 degrees can be specified other than up, down, left and right
In addition to being equipped with a function for automatically calculating equilateral triangles, the colors can be changed freely.
Please use it for balloons and flowcharts.

.triangle {
  width: 0;
  height: 0;
  border-style: solid;
  border-top: 50px solid transparent;
  border-bottom: 50px solid transparent;
  border-left: 60px solid #555555;
  border-right: 0;

Style editor

Other specifications

How to use the tool

・I don't know how to use the tool.
・I want to know various ways to use it
・I want to know the details of each item
For those who like, we have prepared a video that introduces the contents and features and explains how to use it.

Please take advantage of it.

Lots more videos on Youtube!

List of generators

List of other Tools

Description of each CSS property

The border property allows you to set a border (element boundary) on an element.
Each value (value) can be specified as follows
border: border widthborder typeborder color
Example description) border: 1px solid #333
Incidentally, the order of the values does not matter; the initial value of border is none.
Each value can also be specified individually, for example
  • border-width
  • border-style
  • border-color
Example description) border-width: 10px;
Example description) border-style: solid;
Each of these can also be oriented.
Example of border-width
  • border-top-width
  • border-right-width
  • border-bottom-width
  • border-left-width
Example of border-style
  • border-top-style
  • border-right-style
  • border-bottom-style
  • border-left-style
Example of border-color
  • border-top-color
  • border-right-color
  • border-bottom-color
  • border-left-color
In addition to solid, the following values can be specified for border-style.
  • double. Two straight lines (double lines) are displayed and the total width is the px size specified in border-width.
  • groove. It is displayed as a three-dimensional depressed line.It is the reverse of ridge.
  • ridge.It appears as a three-dimensional raised line, the opposite of groove.
  • inset. The top and left lines will appear darker, the bottom and right lines will appear lighter, and the entire image will appear as if it is three-dimensionally depressed. This is the opposite of outset.
  • outset. The top and left lines will appear lighter, while the bottom and right lines will appear darker, giving the appearance of three-dimensional ridges. The opposite is true of inset.
  • dashed. Displays a dashed line. Displays a series of dashes or line segments with short, square corners.
  • dotted. It is displayed as a dotted line. Specifically, it displays a series of round dots. The radius of the dots is half of the calculated border-width of the same edge.
Note, however, that dotted, dashed, etc. may be rendered differently in different browsers.
You can also define the direction in which the border is to be specified.
  • border-top
  • border-bottom
  • border-right
  • border-left
Example description) border-left: 10px solid #333;
When specifying colors on the Web, "HEX," "RGB," and "HSL" are often used.
First of all, HEX, which you see most often (hexadecimal number), is a way of expressing colors in hexadecimal. It is expressed in the form of #1234ab.
The six digits after # are the values of red (1st~2nd digits), green (3rd~4th digits), and blue (5th~6th digits). Various colors are represented according to the color intensity of each value.
If each of the two digits is the same value, a three-digit expression can be used. For example, #aa9933 can be represented as #a93.
If you want to specify the transparency in hexadecimal, you can use an 8-digit number, with the 7th to 8th digits also in hexadecimal. 80% transparency can be specified with #aa9933CC, for example.
RGB, like HEX, is capable of representing colors in red, green, and blue.
Each value can be specified in the range 0 ~ 255 and is represented as rgb(red value, green value, blue value).
Example description) rgb(10, 50, 220)
If you want to specify transparency, you can use rgba(red value, green value, blue value, transparency(alpha)).
The alpha value can be specified in the range 0~1, for example rgba(0, 0, 255, .5).
HSL stands for Hue, Saturation, and Lightness.
When specifying colors in HSL, colors are specified using these three elements. Once the hue (type and shade of color) is determined, colors can be determined by adjusting saturation and lightness, which is more intuitive than RGB.
The following can be specified: hsl(hue, saturation, lightness)
  • Hue:Basically, you can specify a number between 0 and 360. If you specify a number beyond this range, it will be considered as a circumference, so for example, if you specify 380, it will be the same as 20.
  • Lightness:You can specify a value between 0 and 100%; the closer to 100%, the brighter the image. Conversely, the closer the value is to 0%, the darker it becomes.
If you want to specify transparency, there is hsla. Like rgba, the final a represents the alpha (transparency).
alpha values can be specified from 0 to 1, for example, hsla(80, 80%, 50%, .5).