html, body{
  margin: 0; /*変な余白をなくす*/
}

header{
  height: 80px;
  padding: 2% 0;
  background: #d6f3ef;
}
header,body{
  text-align: center;
  font-family: sans-serif;
}

.question, h2, label, li, .footer{
  margin-left: 20px;
  margin-right: 20px;
}

#tweet-area{
  margin-top: 3%;
}

.footer{
  margin: 2% 0;
}
.footer > a{
  display: inline-block;
  margin-bottom: 3px;
  text-decoration: none;
  border: solid 2px #005B95;
  background-color: white;
  color: #005B95;
  font-weight: bold;
  border-radius: 8px;
  padding: 2px 10px;
}