:root {
  --star-size: 30px;
  --menu-size: calc(var(--star-size) * 5);
  --bg-full: url('data:image/svg+xml,<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 -960 960 960" fill="%23fff7c6"><path d="m233-120 65-281L80-590l288-25 112-265 112 265 288 25-218 189 65 281-247-149-247 149Z"/></svg>');
  --bg-empty: url('data:image/svg+xml,<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 -960 960 960" fill="%23fff7c6"><path d="m354-287 126-76 126 77-33-144 111-96-146-13-58-136-58 135-146 13 111 97-33 143ZM233-120l65-281L80-590l288-25 112-265 112 265 288 25-218 189 65 281-247-149-247 149Zm247-350Z"/></svg>');
}
html,
body {
  height: 100%;
}
body {
  background: radial-gradient(
    circle,
    rgba(206, 0, 0, 1) 0%,
    rgba(87, 0, 0, 1) 100%
  );
}

.heading {
  margin: 0 auto;
  margin-bottom: 40px;
  padding-bottom: 30px;
  text-align: center;
  font-family: "Open Sans", serif;
  font-optical-sizing: auto;
  font-weight: 800;
  font-style: normal;
  font-size: 50px;
  font-variation-settings: "wdth" 100;
  color: rgba(0, 0, 0, 0.5);
  border-bottom: 1px solid #666;
}
menu {
  padding: 0;
  width: var(--menu-size);
  display: flex;
  justify-content: space-between;
  background-color: rgba(0, 0, 0, 0.2);
  border-radius: 5px;
  padding: 5px;
  box-shadow: 1px 1px 0 1px rgba(255, 255, 255, 0.2);
  border-top: 2px solid rgba(0, 0, 0, 0.3);
  border-left: 2px solid rgba(0, 0, 0, 0.3);
  margin: 0 auto;
}
button {
  width: var(--star-size);
  height: var(--star-size);
  background: none;
  background-position: center center;
  background-repeat: no-repeat;
  border: none;
  display: flex;
  cursor: pointer;
}
button:before {
  content: "";
}
button:has(~ button:hover),
button:hover,
button:focus,
button:has(~ button:focus) {
  background-image: var(--bg-full);
}
button,
button:hover ~ button {
  background-image: var(--bg-empty);
}