.on_font {/*トップdiv*/
  position: relative;
  }

.on_font p {
  position: absolute;
  color: white; /*文字は白に*/
  font-weight: bold; /*太字に*/
  font-size: 2em; /*サイズ2倍*/
  font-family :Quicksand, sans-serif; /*Google Font*/
  top: 50%;
  left: 25%;
  }

.on_font img {
  width: 100%;
  }