.wa-float{
  position:fixed; bottom:24px; right:24px; z-index:900;
  width:60px; height:60px; border-radius:50%;
  background:linear-gradient(135deg,#25d366,#128c7e);
  color:#fff; display:flex; align-items:center; justify-content:center;
  font-size:1.8rem; text-decoration:none;
  border:3px solid #0a0a0a;
  box-shadow:0 8px 24px rgba(37,211,102,.4);
  transition:all .25s;
  animation:wa-pulse 2s infinite;
}
.wa-float:hover{transform:scale(1.1); box-shadow:0 12px 32px rgba(37,211,102,.6)}
@keyframes wa-pulse{
  0%{box-shadow:0 8px 24px rgba(37,211,102,.4), 0 0 0 0 rgba(37,211,102,.5)}
  70%{box-shadow:0 8px 24px rgba(37,211,102,.4), 0 0 0 18px rgba(37,211,102,0)}
  100%{box-shadow:0 8px 24px rgba(37,211,102,.4), 0 0 0 0 rgba(37,211,102,0)}
}
@media(max-width:640px){.wa-float{width:54px; height:54px; font-size:1.6rem; bottom:18px; right:18px}}