.back-to-top {
  display: none;
  position: fixed;
  bottom: 20px;
  right: 20px;
  z-index: 100;
  width: 50px;
  height: 50px;
  background: rgba(0, 123, 255, 0.8);
  border: none;
  border-radius: 50%;
  cursor: pointer;
  box-shadow: 0 2px 5px rgba(0, 0, 0, 0.2);
  opacity: 0.7;
  transition: opacity 0.3s;
  display: flex;
  justify-content: center;
  align-items: center;
}
.back-to-top:hover {
  opacity: 0.9;
}

.arrow-up {
  border: solid #ffffff;
  border-width: 0 3px 3px 0;
  display: inline-block;
  padding: 5px;
  transform: translateY(3px) rotate(-135deg);
  transition: border-color 0.3s;
}

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