.navbar-default {
    /* background-color: rgba(255, 255, 255, 1); */
    background-color: rgba(0, 0, 0, 1);
    border: 0px;
}

div {
  background-color: rgba(255, 255, 255, 0.55)   /* 55% opaque white */;
  padding: 0.25em;
}

body {
  background-repeat: no-repeat;
  /* background-size: 100%; */
  background-size: cover;
  min-height: 1000px;
}