body {
  background-image: url("background.jpg");
  background-color: #f3f3f3;
  text-align: center;
}

body:has(option[value="dark"]:checked) {
  background:
    /* top, transparent black, faked with gradient */
    linear-gradient(rgba(0, 0, 0, 0.7),
      rgba(0, 0, 0, 0.7)),
    /* bottom, image */
    url("background.jpg");
}

select {
  font-size: 2rem;
  padding: 2px 5px;
}

h2 {
  text-align: center;
  color: white;
  font-family: sans-serif;
  font-size: 7em;
}

p {
  font-family: sans-serif;
  color: #ffffff;
  font-size: 4em;
}

.container {
  width: 100%;
  height: 800px;
  display: flex;
  justify-content: center;
  align-items: center;
}

.glass {
  width: 800px;
  height: 300px;
  margin: 50px;
  justify-content: center;
  align-items: center;
  backdrop-filter: blur(5px) brightness(80%);
  border-color: rgba(230, 230, 230, 0.6);
  border-radius: 50px;
  border-style: solid;
  box-shadow: 25px 25px 50px 25px rgba(0, 0, 0, 0.2);
}

.glass:hover {
  background-color: rgba(230, 230, 230, 0.1);
  backdrop-filter: saturate(70%) blur(10px);
  box-shadow: 15px 15px 25px 10px rgba(150, 150, 150, 0.3),
    -12px -12px 25px rgba(255, 255, 255, 0.4) inset;
}