body {
  font-family: "Sawarabi Mincho";
  margin: 0 auto;
  width: 100%;
  height: 100%;
}

#contents_body{
  margin: 0 auto;
  width: 100%;
  min-height: 100vh;
  background: rgba(255,255,255,0.3);
}

#menu_title{
  width: 95%;
  margin-top: 0.5rem;
  margin-bottom: 0.5rem;
  margin-left: 0.1rem;
  margin-right: auto;
  font-size: 2.5rem;
  font-style: italic;
  background-image: linear-gradient(white, white 75%, #2FF);
  border-radius: 10px;
}

span#cont_title{
  font-size: 2.5rem;
  font-style: italic;
  text-shadow: 3px 3px #BBB;
}

#contents_menu{
  width: 100%;
  height: 100%;
  margin: 0 auto;
}

div.in_sell{
  width: 95%;
  margin-top: 0.5rem;
  margin-bottom: 0.5rem;
  margin-left: auto;
  margin-right: 0.1rem;
  border-style: solid;
  border-color: black;
  border-width: 2px;
  border-radius: 10px;
  overflow: auto;
  background-image: linear-gradient(white, white 75%, #bb6);
  font-size: 1.2rem;
}

span.title{
  float: left;
  margin-left: 1rem;
}

span.desc{
  float: right;
  margin-right: 1rem;
}

.clearfix:after {
  clear: both;
  visibility: hidden;
}

@media only screen and (min-width: 1023px){
  body {
    font-family: "Sawarabi Mincho";
    margin: 0 auto;
    width: 640px;
    min-height: 480px;
  }

  #contents_body{
    margin: 0 auto;
    width: 100%;
    min-height: 480px;
    background: rgba(255,255,255,0.3);
  }

  #menu_title{
    width: 95%;
    margin-top: 0.5rem;
    margin-bottom: 0.5rem;
    margin-left: 0.1rem;
    margin-right: auto;
    font-size: 1.2rem;
    font-style: italic;
    background-image: linear-gradient(white, white 75%, #2FF);
    border-radius: 10px;
  }

  span#cont_title{
    font-size: 2.0rem;
    font-style: italic;
    text-shadow: 3px 3px #BBB;
  }

  #contents_menu{
    width: 100%;
    height: 100%;
    margin: 0 auto;
  }

  div.in_sell{
    width: 95%;
    margin-top: 0.5rem;
    margin-bottom: 0.5rem;
    margin-left: auto;
    margin-right: 0.1rem;
    border-style: solid;
    border-color: black;
    border-width: 2px;
    border-radius: 10px;
    overflow: auto;
    background-image: linear-gradient(white, white 75%, #bb6);
  }

  span.title{
    float: left;
    margin-left: 1rem;
  }

  span.desc{
    float: right;
    margin-right: 1rem;
  }

  .clearfix:after {
    clear: both;
    visibility: hidden;
  }
}