.centered {
  height: 20%;
  justify-content: center;
  position: fixed;
  bottom: 0%;
  display: flex;
  flex-direction: row;
  width: 100%;
  margin: 0px auto;
  left: 0;
  right: 0;
}

button {
  display: flex;
  align-items: center;
  justify-content: center;
  border: 2px solid white;
  background-color: transparent;
  width: 2em;
  height: 2em;
  border-radius: 100%;
  font-size: 2em;
  background-color: rgba(0, 0, 0, 0.4);
  color: white;
  outline: none;
}