.yt-caption {
  display: block; 
  text-align: center; 
  padding-bottom: 10px; 
  font-size: 12px
}
.yt-caption-big {
  width: 560px; 
}
.yt-caption-small {
  width: 385px; 
}

.yt-wrapper-left {
  float: left; 
  padding: 10px;
}
.yt-wrapper-right {
  float: right; 
  padding: 10px;
}
.yt-wrapper-center {
  text-align: center;
}

.yt-wrapper-center .yt-caption {
  margin: 0 auto;
}