body {
  background-color: #Effead;
}

h1 {
  text-align: center;
}

.a {
  text-align: center;
  font-size: 2em;
}

.b {
  text-align: center;
}

button {
  width: auto;
  padding: 0;
  margin: 0;
  background: none;
  border: 0;
  font-size: 0;
  line-height: 0;
  overflow: visible;
}

/*縦画面用*/
@media screen and (orientation: portrait) {
  header{
    margin: 0;
    padding: 0;
    text-align: center;
  }

  .title{
    width: 80%;
  }

  .center {
    position: absolute;
    top: 30%;
    left: 50%;
    transform: translateX(-50%);
    -webkit-transform: translateX(-50%);
    -moz-transform: translateX(-50%);
    z-index: 1;
  }

  #image{
    width: 800px;
  }

  .inner {
    text-align: center;
    font-size: 1.5em;
    width: 43%;
    height: 10%;
    padding: 30px;
    border: 1px solid black;
    background-color: rgba(255, 210, 111, 0.5);
    margin: 0 auto;
    position: absolute;
    top: 77%;
    left: 50%;
    transform: translateX(-50%);
    -webkit-transform: translateX(-50%);
    -moz-transform: translateX(-50%);
    z-index: 2;
  }

  #back_image{
    width: 100%;
    height: 100%;
  }

  .box {
    width: 100%;
    height: 900px;
    margin-top: 20%;
    padding: 0;
    border: 1px solid black;
    background-color: lightgray;
    z-index: 0;
  }

  .migisita {
    position: absolute;
    margin-top: 10%;
    right: 5%;
  }

  .hidarisita {
    position: absolute;
    margin-top: 10%;
    left: 5%;
  }
}

/*横画面用*/
@media screen and (orientation: landscape) {

  header{
    margin: 0;
    padding: 0;
    text-align: center;
  }

  .title{
    width: 15%;
    height: 3%
  }

  .center {
    position: absolute;
    top: 13%;
    left: 50%;
    transform: translateX(-50%);
    -webkit-transform: translateX(-50%);
    -moz-transform: translateX(-50%);
    z-index: 1;
  }

  #image{
    width : 250px;
  }

  .inner {
    text-align: center;
    font-size: 1.3em;
    width: 70%;
    height: 13%;
    padding: 15px;
    border: 1px solid black;
    background-color: rgba(255, 210, 111, 0.5);
    margin: 0 auto;
    position: absolute;
    top: 70%;
    left: 50%;
    transform: translateX(-50%);
    -webkit-transform: translateX(-50%);
    -moz-transform: translateX(-50%);
    z-index: 2;
  }

  .box {
    width: 65%;
    height: 250px;
    margin: auto;
    padding: 0;
    border: 1px solid black;
    background-color: lightgray;
    z-index: 0;
  }

  #back_image{
    width: 100%;
    height: 100%;
  }

  .migisita {
    position: absolute;
    right: 0;
    transform: translateY(-100%);
    -webkit-transform: translateY(-100%);
    -moz-transform: translateY(-100%);
  }

  .hidarisita {
    position: absolute;
    left: 0;
    transform: translateY(-100%);
    -webkit-transform: translateY(-100%);
    -moz-transform: translateY(-100%);
  }
}

.link {
  text-align: center;
  font-size: 2em;
  font-weight: bold;
}

.go {
  font-size: 2em;
  text-align: center;
}