For the next step, we will need to create a style sheet where we can copy the code. 

Process:

Open a Finder window with your project folders before starting.

With TextEdit open, click New. 

Copy  the code this code:
*{ font-family: sans-serif; } h1,h4{ text-align: center; } #me{ position: relative; width: 50%; margin: 0 auto; display: block; } #me video{ position: relative !important; } #remote-container{ display: flex; } #remote-container video{ height: auto; position: relative !important; }
Paste the code into the text editor. 

Click Save. 

Select the Style folder in order to save the file into this folder. 

In the Save As field, type style.

Click Save.

From the Finder window, open the Styles folder.

Select the Style file. 

Press Control + Left-Click (or Right-Click) and select Get Info. 

In the Name & Extension field, change the file format to .css. 

Confirm the change. Click Use .css.