I took a quick gander and you are almost there, but Bootstrap css takes responsibility for your css. Bootstrap has:
.carousel-control .glyphicon-chevron-right{
...
display:inline-block;
}
If you need to assign an arbitrary point value, Bootstrap provides "2 points" to provide an inline-block style.
css Bootstrap, ( Bootstrap 2 ), ".glyphicon-chevron-right" .
.carousel .glyphicon-chevron-right{display:none;}
, , "", ( 256)
#myCarousel .glyphicon-chevron-right{display:none;}