How can I remove the author box for the narrow width

Thanks.
I tried, but it does not work.
I changed as follows:
.ts-fab-wrapper { display: none; }

I’m using Fancier Author box.

sure, for example, http://www.leunkim.com/routine/hyehwa

I added the code on my CSS as

@media (max-width: 776px) {
#page{clear:both; max-width:600px; !important; padding:0; !important; margin:auto; overflow:hidden; margin-top:15px; margin-bottom:15px;}

#primary{max-width:600px; padding:0; margin:0 0 0 20px;}
#banners2 {display:none;}
#secondary {display: none;}
#ts-fab-wrapper {display:none;}
.ts-fab-wrapper {display:none;}
#ts-fab {display:none;}
.ts-fab {display:none;}
#main #content {max-width: 560px; margin:auto; padding: 0;}
.commentlist {width: 100%;}
.commentlist > li.comment,
.commentlist .pingback {margin-left: 50px;width: auto;}
}