html {
  width: 100%;
  height: 100%;
  background-color: #263238;
  background-size: cover;
   -webkit-background-size: cover;
  -moz-background-size: cover;
  -o-background-size: cover;
  z-index: 20;
}

.div-latest-articles {
  width: 100%;
  height: 100%;
}