body {
  background-color: #f5f9fb;
  font-family: Heletica Neue,Arial,Hiragino Sans,Hiragino Kaku Gothic ProN,BIZ UDPGothic,Meiryo,sans-serif;
  margin: 0;
  min-height: 100vh;
  padding: 1rem 1rem;
}

footer {
  background-color: #FFF;
  border-radius: .5rem;
  padding: .5rem 0;
  position: sticky;
  text-align: center;
  top: 100vh;
  top: 100dvh;
}

a {
  color: #6CC9D4;
  text-decoration: none;
  transition: all 0.2s;
}

a:hover {
  color: gray;
}