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Border with Top Triangle

Beginner

This tutorial is from open-source community. Access the source code

Introduction

In this lab, we will be learning how to create a content container with a triangle at the top using CSS. This is a common design element used in many websites and applications to add visual interest and create a sense of hierarchy. By the end of this lab, you will have the skills to create this effect and apply it to your own projects.

This is a Guided Lab, which provides step-by-step instructions to help you learn and practice. Follow the instructions carefully to complete each step and gain hands-on experience. Historical data shows that this is a beginner level lab with a 100% completion rate. It has received a 100% positive review rate from learners.

Border With Top Triangle

index.html and style.css have already been provided in the VM.

To create a content container with a triangle at the top, follow these steps:

  1. Use the ::before and ::after pseudo-elements to create two triangles.
  2. Set the border-color and background-color of the triangles to match the container.
  3. Set the border-width of the ::before triangle to be 1px wider than the ::after triangle to act as the border.
  4. Position the ::after triangle 1px to the right of the ::before triangle to allow for the left border to be shown.

Here is an example HTML code for the container:

<div class="container">Border with top triangle</div>

And here is the corresponding CSS code:

.container {
  position: relative;
  background: #ffffff;
  padding: 15px;
  border: 1px solid #dddddd;
  margin-top: 20px;
}

.container::before,
.container::after {
  content: "";
  position: absolute;
  bottom: 100%;
  left: 19px;
  border: 11px solid transparent;
}

.container::before {
  border-bottom-color: #dddddd;
}

.container::after {
  left: 20px;
  border: 10px solid transparent;
  border-bottom-color: #ffffff;
}

Please click on 'Go Live' in the bottom right corner to run the web service on port 8080. Then, you can refresh the Web 8080 Tab to preview the web page.

Summary

Congratulations! You have completed the Border With Top Triangle lab. You can practice more labs in LabEx to improve your skills.