.btt {
  position: fixed;
  bottom: 50px;
  right: 50px;
  width: 44px;
  height: 44px;
  background: var(--brand-secondary);
  border-radius: calc(infinity * 1px);
  justify-content: center;
  align-items: center;
  cursor: pointer;
  transition: all 300ms ease;
  border: 1px solid var(--brand-text);
  z-index: 1;
}
.btt svg {
  fill: var(--brand-primary);
  width: 24px;
  height: 24px;
}