body {
  background-color: #333;
  font-size: 18px;
  color: #333333;
  font-family: "THSarabunNew", Tahoma, Loma;
}
body,
li {
  line-height: 2;
}
main {
  -moz-border-radius: 11px;
  -webkit-border-radius: 11px;
  border-radius: 11px;
  background-color: #ffffff;
  border: 1px solid #dfdfdf;
  margin: 2em auto;
  padding: 1em 2em;
  width: 800px;
  max-width: 85%;
}
h1 {
  font-size: 250%;
  text-shadow: 1px 1px 5px #666;
}
h2 {
  color: #999;
  display: block;
  border-bottom: 1px solid #bbbbbb;
  padding-bottom: 5px;
}
ul {
  list-style-type: none;
  padding: 0;
}
li {
  border-bottom: 1px dashed #ddd;
}
.correct {
  background: transparent url(img/valid.png) 0 50% no-repeat;
  color: #093;
  padding-left: 20px;
}
.incorrect {
  background: transparent url(img/invalid.png) 0 50% no-repeat;
  color: #f00;
  padding-left: 20px;
}
.footer {
  text-align: center;
  color: #999;
  margin-top: 10px;
  padding: 1em 2em 0 2em;
  border-top: solid 1px #ddd;
}
a.icon-help {
  color: red;
  font-size: 1.4em;
}