body {
  max-width: 780px;
  min-height: 100vh;
  margin: 0 auto;
  padding: 1rem;
  font-size: 18px;
  font-family: "Noto Sans JP", sans-serif;
  font-weight: 400;
  font-style: normal;
}

img {
  max-width: 100%;
  height: auto;
}

a {
  color: #1a73e8;
  text-decoration: none;
  word-break: break-all;
}

li {
  padding: .2em 0;
}

.header {
  padding: 2rem 0;
  text-align: center;
}

.header-logo {
  text-decoration: none;
  color: #000;
  font-weight: bold;
  font-size: 2rem;
}

.icon {
  width: 70%;
}

.section {
  margin-bottom: 4em;
}

.identity {
  display: flex; 
  justify-content: space-between;
  align-items: center;
  margin-right: auto;
  margin-left: auto;
}

.footer {
  text-align: center;
}

.twitter-tweet {
  margin: auto;
}