.fullscreen-slideshow-btn {
  position: fixed;
  bottom: 20px;
  left: 20px;
  width: 50px;
  height: 50px;
  background-color: #ffffff;
  color: #555555;
  border: none;
  border-radius: 50%;
  box-shadow: 0 2px 5px rgba(0,0,0,0.3);
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 1000;
  padding: 0;
  transition: background-color 0.3s ease;
}

.fullscreen-slideshow-btn:hover {
  background-color: #f0f0f0;
}

.fullscreen-slideshow-btn svg {
  width: 24px;
  height: 24px;
  stroke: currentColor;
  fill: none;
  stroke-width: 2;
  stroke-linecap: round;
  stroke-linejoin: round;
}