Modify Child Theme

Hi, I’m using Twenty Eleven as a child theme. I followed your directions in order to customize my calendar and put a folder in my child theme called “tribe-events.” Then I made a style sheet in there called “tribe-events.css.” This is where I put a few modifications but I don’t see them. Here’s my code. Do I need an @import? It didn’t say to but I wonder.

‘/* Change color on ‘Upcoming Events’ */
#tribe-events-page-title {
color: #C00;
}

/* Ensure page is right size for mobile */
@media only screen and (max-width: 480px) {

#tribe-events-pg-template {
margin: 0 auto;
width: 482px;
}
}’

Thanks.

https://www.ads-software.com/plugins/the-events-calendar/