:root {
  --main-bg-color: #ddd;
  --main-color: #333;
}

body {
  background-color: #000;
  color: #fff;
  min-height: 100vh;
  margin: 0;
  display: grid;
  grid-template-rows: auto 1fr auto;
}

header {
  min-height:64px;
  background-color: var(--main-color);
  border: 1px solid var(--main-bg-color);
}

footer {
  min-height:24px;
}

.box {
  background-color: var(--main-color);
  border: 1px solid var(--main-bg-color);
}

header .box {
  float: left;
  padding: 1em;
  height: 60px;
}

main {
  clear: left;
}

/* tab controls */
.tabs {
  overflow: hidden; /* what does this do? */
}
.tabs button {
  float: left;
}
.tabs button:hover {
  background-color: #ddd;
}
.tabs button.active {
  background-color: #ccc;
}
.tab {
  display: none;
}

/* table */
thead {
  background-color: #ccc;
}

/* navigation */




/* player controls */
#player-controls {
  border: 1px solid blue;
}