#scrollToTopBtn {
  position: fixed;
  bottom: 30px;
  right: 30px;
  width: 40px;
  height: 40px;
  border-radius: 50%;
  border: 1px solid rgba(0, 0, 0, 0.3);
background-color: #F5EFE6;
  display: none;
  justify-content: center;
  align-items: center;
  cursor: pointer;
  z-index: 999;
  padding: 0;
  box-sizing: border-box;
}

/* Vòng chạy xung quanh */
#scrollToTopBtn::before {
  content: '';
  position: absolute;
  top: -5px;
  left: -5px;
  width: 50px;
  height: 50px;
  border-radius: 50%;
  background: conic-gradient(#8C795F var(--scroll, 0%), transparent 0%);
  z-index: 0;
  pointer-events: none;
}

/* Lớp che trong để tạo đường viền mảnh */
#scrollToTopBtn::after {
  content: '';
  position: absolute;
  top: -3px;
  left: -3px;
  width: 46px;
  height: 46px;
  border-radius: 50%;
background-color: #F5EFE6;
  z-index: 1;
  pointer-events: none;
}





#scrollToTopBtn i {
  position: relative;
  z-index: 2;
  font-size: 16px; /* hoặc tùy chỉnh kích thước */
  color: black;
}
.rotating-text {
  position: absolute;
  width: 100%;
  height: 100%;
  animation: rotateText 8s linear infinite;
  transform-origin: center;
  z-index: 1;
}

@keyframes rotateText {
  0% {
    transform: rotate(0deg);
  }
  100% {
    transform: rotate(360deg);
  }
}