footer {
  background-color: #9b9b9b;
  height: 100px;
  width: 100%;
  display: flex;
  align-items: center;
  justify-content: center;
}
footer .navigation {
  margin-left: 20%;
}
footer .icon_navigation {
  width: 15%;
  height: auto;
  margin-left: 5%;
}
footer .icon_navigation img {
  width: 20%;
  background-color: #4d4c4c;
  border-radius: 10px;
}
footer .icon_navigation img:hover {
  transition: 1s;
  border-radius: 10px;
  background-color: #dcdce0;
}