index.css

*:focus {
  outline: none;
}

html {
  height: 100%;
}

html, body {
  width: 100%;
  margin: 0;
  padding: 0;
  font: 100 1rem 'Segoe UI', 'San Francisco', sans-serif;
  color: #fff;
  -ms-overflow-style: none;
}

body {
  display: flex;
  flex-wrap: wrap;
  align-items: flex-start;
  position: relative;
  height: 100%;
  background: #000 center / cover no-repeat fixed;
}

.windows-11 .fluent-btn__btn {
  border-radius: 6px;
}

.blur-bg-fallback {
  position: fixed;
  overflow: hidden;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: inherit;
  z-index: -1;
}

.blur-bg-fallback::before {
  content: '';
  top: -30px;
  left: -30px;
  right: -30px;
  bottom: -30px;
  position: absolute;
  background: inherit;
  filter: blur(14px);
}

@supports (-webkit-backdrop-filter: blur(14px)) or (backdrop-filter: blur(14px)) {
  .blur-bg-fallback {
    display: none;
  }
  body::before {
    content: '';
    position: fixed;
    z-index: -1;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    -webkit-backdrop-filter: blur(14px);
    backdrop-filter: blur(14px);
  }
}

header {
  width: 100%;
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  margin-top: 4rem;
}

a {
  text-decoration: none;
  cursor: default;
}

h1 {
  margin: 0;
  font-size: 3rem;
  font-weight: 100;
  margin-bottom: 3rem;
}

main {
  display: flex;
  flex-flow: column;
  align-items: center;
  padding: 0 3rem;
  box-sizing: border-box;
  width: 100%;
}

#sites {
  width: 100%;
  max-width: 850px;
  display: grid;
  grid-template: auto / repeat(auto-fill, minmax(200px, 1fr));
  justify-items: center;
  grid-row-gap: 2rem;
  margin: 5rem 0 6rem;
}

.hello-smiley {
  max-width: 100px;
}

#name:focus {
  outline: none;
  background: rgba(0, 0, 0, 0.4);
}

@media screen and (max-width: 600px) {
  main {
    padding: 0 1rem;
  }
}

body>* {
  transition: opacity 200ms 100ms ease-in;
}

.has-scrollbar::-webkit-scrollbar, .has-scrollbar ::-webkit-scrollbar {
  width: 0;
}

html {
  scrollbar-width: none;
}