html {
  scroll-behavior: smooth;
}
.btn-float-up {
    display: none;
    position: fixed;
    width: 60px;
    height: 60px;
    bottom: 40px;
    right: 40px;
    background-color: #ff5900;
    font-size: 30px;
    scroll-snap-align: start;
    color: #FFF;
    border-radius: 15px;
    text-align: center;
    box-shadow: 2px 2px 3px #999;
    z-index: 9999;
    padding-top: 15px;
}

@media only screen and (max-width: 767px) {
  .btn-float-up {
    font-size: 20px;
    width: 50px;
    height: 45px;
    bottom: 20px;
    right: 20px;
    padding-top: 10px;
   }
  }

}