.sam-ybtn{
  display:inline-flex;
  align-items:center;
  justify-content:center;
  padding:10px 14px;
  border-radius:999px;
  text-decoration:none;
  font-weight:600;
  line-height:1;
  border:1px solid rgba(0,0,0,.15);
  background:#111;
  color:#fff;
  box-shadow:0 6px 18px rgba(0,0,0,.2);
}
.sam-ybtn:hover{ opacity:.92; }
.sam-ybtn:focus{ outline:2px solid rgba(0,0,0,.35); outline-offset:2px; }

.sam-ybtn-floating{ position:fixed; z-index:99999; cursor:pointer; }
.sam-ybtn-pos-br{ right:18px; bottom:18px; }
.sam-ybtn-pos-bl{ left:18px; bottom:18px; }
.sam-ybtn-pos-tr{ right:18px; top:18px; }
.sam-ybtn-pos-tl{ left:18px; top:18px; }

@media (max-width: 480px){
  .sam-ybtn{ padding:10px 12px; font-size:14px; }
  .sam-ybtn-pos-br, .sam-ybtn-pos-bl{ bottom:14px; }
  .sam-ybtn-pos-br, .sam-ybtn-pos-tr{ right:14px; }
  .sam-ybtn-pos-bl, .sam-ybtn-pos-tl{ left:14px; }
  .sam-ybtn-pos-tr, .sam-ybtn-pos-tl{ top:14px; }
}