*,
*::before,
*::after {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

:root {
  --accent-color: yellow;
  --text-color: #333;
  --background-color: #fff;
  --btn-text-color: #fff;
}

body {
  background-color: var(--background-color);
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  height: 100vh;
  overflow: hidden;
  transition: 1s;
}

.dark {
  --accent-color: orangered;
  --text-color: #fff;
  --background-color: #333;
  --btn-text-color: #333;
}

h1 {
  font-family: ubuntu;
  font-size: 4rem;
  text-align: center;
  color: var(--text-color);
  margin-bottom: 2rem;
  transition: color 1s;
  z-index: 2000;
}

#theme-toggle-btn {
  font-family: ubuntu;
  font-size: 3rem;
  padding: 0.25rem 0.75rem;
  border: none;
  outline: none;
  border-radius: 5px;
  background-color: var(--accent-color);
  color: var(--btn-text-color);
  transform: scale(1);
  transition: 1s;
  cursor: pointer;
}

#theme-toggle-btn:hover {
  transform: scale(1.2);
}

.sun-moon-container {
  --rotation: 0;

  position: absolute;
  top: 0%;
  height: 200vmin;
  display: flex;
  justify-content: center;
  align-items: center;
  transition: 1s;
  transform: rotate(calc(var(--rotation) * 1deg));
  pointer-events: none;
}

.sun,
.moon {
  position: absolute;
  width: 170px;
  height: 170px;
}

.sun {
  top: 5%;
  opacity: 1;
  transition: 1s;
}
.dark .sun {
  opacity: 0;
}

.moon {
  bottom: 5%;
  opacity: 0;
  transform: rotate(180deg);
  transition: 1s;
}

.dark .moon {
  opacity: 1;
}