body {
  --background-color: #f2f2f2;
  --color: #181818;
}

body.dark-mode {
  --background-color: #181818;
  --color: #f2f2f2;
}

@media (prefers-color-scheme: dark) {
  body {
    --background-color: #181818;
    --color: #f2f2f2;
  }
  
  body.light-mode {
    --background-color: #f2f2f2;
    --color: #181818;
  }
}

* {
  font-family: Calibri, Tahoma, sans-serif;
}

body {
  text-align: center;
  background-color: var(--background-color);
  color: var(--color);
}

.center {
  position: absolute;
  top: 40%;
  left: 50%;
  transform: translate(-50%, -50%);
  margin: 0;
}

.invisible {
  display: none;
}

.theme-menu {
  position: absolute;
  top: 1rem;
  right: 1rem;
}

.theme-button {
  border:none;
  background: transparent;
}

.theme-icon {
  stroke: var(--color) !important;
  fill: var(--color) !important;
  width: 24pt;
  height: 24pt;
}

.theme-icon:hover {
  filter: invert(50%);
}