style.css

:root {
  font-family: Creepster, sans-serif;
  font-weight: 400;

  color-scheme: light dark;
  color: rgba(255, 255, 255, 0.87);
  background-color: #242424;

  font-synthesis: none;
  text-rendering: optimizeLegibility;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  -webkit-text-size-adjust: 100%;
}

body {
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  place-items: center;
  min-width: 320px;
  min-height: 100vh;
  padding-top: 50px;
}

h1 {
  font-size: 6.4em;
  line-height: 1.1;
}

#app {
  max-width: 1280px;
  margin: 0 auto;
  padding: 2rem;
  text-align: center;
  display: grid;
  grid-template-areas: "1f 1f 1f 1f 1f 1f 1f 1f 1f 1f";
  grid-auto-columns: max-content;
  gap: 30px;
}

.logo {
  height: 6em;
  padding: 1.5em;
  will-change: filter;
  transition: filter 300ms;
}


.square:hover {
  filter: drop-shadow(0 0 2em #f7df1eaa);
}

.card {
  padding: 2em;
}

.ph-bold {
  font-size: 48px;
}



.square {
  width: 100px;
  height: 100px;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  background-color: #242424;
  color: transparent;
}


.clicked {
  width: 100px;
  height: 100px;
  display: block;

  background-color: #000000;
  cursor: not-allowed;
  color: limegreen;
}



@media (prefers-color-scheme: light) {
  :root {
    color: #213547;
    background-color: #ffffff;
  }

}