:root {
  --background: black;
  --foreground: white;
}

body {
  margin: 0;
}

#background {
  z-index: 0;
}

#content {
  left: 0;
  height: 100vh;
  overflow-y: auto;
  position: absolute;
  top: 0;
  width: 100%;
  z-index: 1;
}

.flex-container {
  display: flex;
  width: 100%;
  padding: 10px;
}

.flex-space-between {
  justify-content: space-between;
}

.flex-center {
  justify-content: center;
}

.items {
  display: grid;
  grid-template-columns: repeat(1, 1fr);
  grid-gap: 56px;
}

.items > div {
  display: flex;
  height: fit-content;
  justify-content: center;
}

@media screen and (min-width: 800px) {
  .items {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media screen and (min-width: 1400px) {
  .items {
    grid-template-columns: repeat(3, 1fr);
  }
}

#controller {
  border: 10px solid var(--background);
  display: inline-block;
}

#controller button {
  background-color: var(--background);
  border: none;
  height: 32px;
  outline: solid 1px var(--foreground);
  width: 32px;
}

#controller button:hover,
#controller button.on {
  background-color: var(--foreground);

}

@keyframes spinning {
  from {
    transform: rotate(0deg);
  }
  to {
    transform: rotate(360deg);
  }
}

#spinner img:hover {
  animation: spinning 1s linear infinite;
}

#keyboard {
  background-color: var(--foreground);
  border: 10px solid var(--background);
  border-style: double double solid double;
  display: grid;
  grid-template-columns: repeat(28, 30px);
  grid-template-rows: repeat(4, 70px);
  grid-gap: 5px;
  margin-bottom: 52px;
  padding: 12px;
}

.key {
  background-color: var(--foreground);
  border: 12px solid var(--background);
  border-style: double double solid double;
  grid-column: span 2;
  font-size: 20px;
  text-align: center;
  padding-top: 17px;
}

.key:hover {
  background-color: var(--background);
  border-color: var(--foreground)
}

.span-three {
  grid-column: span 3;
}

.span-four {
  grid-column: span 4;
}

.span-five {
  grid-column: span 5;
}

.span-space {
  grid-column: span 14;
}