/* -----------
   H E A D E R
   -----------*/

header {
  position: fixed;
  left: 0;
  right: 0;
  top: 0;
  height: 40px;
  background-color: rgba(0, 0, 0, 0.5);
  z-index: 10;
}

header img {
  height: 25px;
  margin-top: 7px;
  margin-left: 7px;
  cursor: pointer;
}

header img.logo {
  display: none;
}

/* Medium devices (landscape tablets, 768px and up) */

@media only screen and (min-width: 880px) {
  header {
    height: 60px;
  }

  header img {
    height: 40px;
    margin-top: 10px;
    margin-left: 10px;
  }
}