@charset "UTF-8";

body {
  background: url( swim.gif) no-repeat top;
  background-attachment: fixed;
  background-color:none;
  background-size: cover;
}

main
{
  font-size: 1rem;
  background-color: #EFEFEF;
  margin: 20% 20% 10% 20%;
  padding:5% 10%;
}

#t1{
  margin: 10% 15% 20% 15%;
}

#tlast{
  margin: 5% 15%;
}

nav{
  text-align: center;
}


nav ul {
    margin: 0 auto;
    padding: 0 ;
}

nav ul li {
  list-style: none;
  display: inline-block;/*メニュー横並び*/
  padding: 5% 0% 5% 10%;
  font-size: 1rem;
}

nav ul li a{
 text-decoration:none;
 color: #5B5B5B;
}
nav li:visited{
   color: #5B5B5B;
}