* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
  font-family: Verdana, sans-serif;
}

body {
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  gap: 40px;
  height: 100vh;
  background-color: #ffffff;
  color: #000;
  transition: 0.4s ease;
}

body.dark-mode {
  background-color: #000;
  color: #fff;
}

#toggle {
  width: 80px;
  height: 40px;
  background-color: #e0e0e0;
  border: 1px solid #bbbbbb50;
  border-radius: 20px;
  position: relative;
  cursor: pointer;
  transition: 0.4s ease;
}

#toggle.night {
  background-color: #2c2c2c;
}

.icon {
  position: absolute;
  top: 0;
  width: 40px;
  height: 100%;
  display: flex;
  justify-content: center;
  align-items: center;
  font-size: 20px;
  transition: opacity 0.4s ease;
}

.icon.sun {
  left: 0;
  opacity: 1;
}

#toggle.night .icon.sun {
  opacity: 0;
}

.icon.moon {
  right: 0;
  opacity: 0;
}

#toggle.night .icon.moon {
  opacity: 1;
}