body {
 font-family: helvetica, arial, 'hiragino kaku gothic pro', meiryo, 'ms pgothic', sans-serif;
}
h1 { font-size: 180%; }
h2 { font-size: 130%; }
h3 { font-size: 110%; }
h4 { font-size: 110%; }
h5 { font-size: 100%; }
#main {
  margin: 20px;
  font-size: 80%;
}
.border_radius {
  border-radius: 15px;
  -webkit-border-radius: 15px;
  -moz-border-radius: 15px;
}
a:link { color: #000060; }
a:visited { color: #8b008b; }
a:hover { color: #ff0000; }
a:active { color: #ff8000; }