Hi There,
It seems like the Google calendar’s width is based on the width of container and section. We have to remove the padding of section and max width the container.
To fix this issue, please add the my-section class to your section:

After that add this custom CSS:
@media (max-width: 767px){
body .my-section.x-section {
padding-left: 0 !important;
padding-right: 0 !important;
}
body .my-section.x-section .x-container {
width: 100% !important;
}
}

Hope it helps 



