Change Events+ Text Box Background Color

Hello, I've managed to get the Events+ plugin configured and working perfectly.

But I would like to customize two text boxes. I used the Simple Custom CSS plugin to change the color of the eab-success-notice text, and the wpmudevevents-payment text.

I would like to change the background color for the green message success box and the yellow 'You haven't paid for this event box.' I'd like to use the Simple Custom CSS plugin for this as well.

I found the post that says gives the details on those text box objects

div.message.success {
border-color: #7eaa4b;
background-color: #e2f2d1;
}

and

#wpmudevevents-payment{
background: #ffffe8;
padding: 10px;
margin: 10px 0;
border: 1px solid #efef1a;
}

But I don't know the exact syntax to use for those 2 objects in the Simple Custom CSS.

Please help.

Thanks and Happy Holidays!