Assessment wanted for the box model skill test 1

Here is the link to the tasks: https://developer.mozilla.org/en-US/docs/Learn/CSS/Building_blocks/Box_Model_Tasks#assessment_or_further_help

I have done the first task and would like some feedback. I’m wondering if I have done it properly? Also, can someone send me the answers for the tasks so i can reflect back please.

Thanks,

My CSS:

.box {
border: 8px solid rebeccapurple;
background-color: lightgray;
padding: 40px;
margin: 40px;
width: 500px;
height: 300px;
font-size: 30px
}

.alternate {
box-sizing: border-box;
width: 596px;
height: 200px;
}

Html:

I use the standard box model.
I use the alternate box model.