.ttl {
   text-align: center;
   margin: 0 auto;
   font-size: 30px;
     font-family: "ÞâÌÀÄ«", YuMincho, "¥Ò¥é¥®¥ÎÌÀÄ« ProN W3", "Hiragino Mincho ProN", "HGÌÀÄ«E", "£Í£Ó £ÐÌÀÄ«", "£Í£Ó ÌÀÄ«", serif;
}
@media only screen and (max-width: 768px) {
  .ttl {
    font-size: 20px;
  }
}