.container-barra {
  width: 100px;
  position: fixed;
  bottom: 10px;
  right: 0;
  display: flex;
  flex-direction: column;
  align-items: flex-end;
  z-index:9999;
}

#boton {
  padding: 10px;
  color: white;
  background: green;
  border: none;
  outline: none;
  cursor: pointer;
}

.barra {
  width: 80%;
  display: flex;
  flex-direction: column;
  align-items: flex-end;
  transition: all 0.5s;
}
.barra li {
  list-style: none;
  width: 50%;
}
.barra li:hover {
  width: 50%;
  transition: all 0.3s;
}
.barra a {
  text-align: center;
  padding: 10px;
  display: block;
  color: white;
}

.facebook {
  background: rgb(0, 100, 250);
}
.instagram {
  background: rgb(0, 160, 223);
}
.whatsapp {
  background: rgb(29, 186, 50);
}

.barra a:hover {
  background: black;
}