html, body {
  height: 100%;
  margin: 0;
}

*,
*::before,
*::after {
  box-sizing: border-box;
}

body {
  background: #000;
  color: #fff;
  font-family: 'Source Sans Pro', sans-serif;
  font-size: 15pt;
  font-weight: 300;
  line-height: 1.5;

  display: flex;
  align-items: center;
  justify-content: center;
}

.site {
  text-align: center;
}

.site h1 {
  margin: 0 0 40px;
  font-size: 3em;
  font-weight: 900;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.buttons {
  display: flex;
  justify-content: center;
  gap: 20px;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 64px;
  height: 64px;
  border: 2px solid #fff;
  border-radius: 50%;
  color: #fff;
  text-decoration: none;
  font-size: 24px;
  transition: transform 0.15s ease, background-color 0.2s ease;
}

.btn i {
  font-size: 1.4rem;
}

.btn:hover {
  background: rgba(255, 255, 255, 0.18);
  transform: scale(1.06);
}

.btn:active {
  background: rgba(255, 255, 255, 0.32);
  transform: scale(0.98);
}

@media screen and (max-width: 736px) {
  body {
    font-size: 12pt;
  }

  .site h1 {
    font-size: 2.2em;
  }

  .btn {
    width: 56px;
    height: 56px;
  }

  .btn i {
    font-size: 1.2rem;
  }
}