@radu Thanks, I was able to sort it out last night.
Basically 2 steps:
1) Adjust settings in Activity Plus
2) Add this to functions.php
COPY CODE
function bigger_embed_size()
{
return array( 'width' => 300, 'height' => 250 );
}
3) Add this CSS
COPY CODE
.fluid-width-video-wrapper {
width: 300px !important;
position: relative;
padding-top: 30% !important;
}
All looks good now!