/* header */
header {
  height: 70px;
  display: flex;
  background-color: white;
}

img.logo {
  margin-left: 40px;
  margin-right: auto;
  align-self: center;
  height: 30px;
}

a.link_menu {
  margin-right: 40px;
  align-self: center;
  text-decoration: none;
  color: #000;
}

a.link_menu:hover {
  color: #00c853;
}

/* footer */
footer {
  position: absolute;
  bottom: 0;
  left: 40px;
  height: 60px;
  line-height: 60px;
}