header {
    display: none;
    width: 100%;
    height: 9vh;
    margin: 0;
    padding: 0;
}

header div {
  /* original color rgb(84,116,252) */
  /* background-color: rgb(72, 104, 250); */
  background-color: rgb(48, 48, 48);
  /* background-color: rgb(235, 235, 235); */
  /* background-color: rgb(0, 0, 0); */
}

header div img {
    width: 100%;
    height: 9vh;
}

/* Show header only on screens 650px or smaller */
@media screen and (max-width: 650px) {
    header {
        display: block;
    }
}