CodePen: Include shadertoy example in the webpage.

This issue can be solve it easy.
You need to get the iframe share from you shadertoy example.
Then use my example HTML and CSS from my codepen example.
You can remove the javascript code from example.
This javascript code is used to show the formula of sphere. I used my shadertoy example named Ray Marching - 001.

Blockly for young programmers.

Blockly is an open source library that makes it easy to add block based visual programming to an app, see the official webpage.
This tool has a good graphics and one great design to understand the flow of programming issue.
This project is good for kids and teenagers to start programming and see the source code into programming languages.
For example, the program build with this tool can be convert into programming language like: Java Script, Python, PHP, Lua and Dart.
You can see a simple video tutorial from the official Google Developers Youtube channel: