.fw-btn{
    position:fixed;
    bottom:20px;
    padding:16px;
    border-radius:50%;
    z-index:99999;
    text-decoration:none;
    box-shadow:0 4px 10px rgba(0,0,0,.3);
}
.fw-right{right:20px;}
.fw-left{left:20px;}

.animate-pulse{animation:pulse 1.5s infinite;}
.animate-bounce{animation:bounce 1s infinite;}

@keyframes pulse{
    0%{transform:scale(1);}
    50%{transform:scale(1.1);}
    100%{transform:scale(1);}
}
@keyframes bounce{
    0%,100%{transform:translateY(0);}
    50%{transform:translateY(-8px);}
}