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HTML 

              
                <!DOCTYPE html>
<html lang="ja">
<head>
<meta charset="utf-8" />
<link rel="stylesheet" href="css/style.css">
</head>

<body>
 <div id="selecter" class="select-box01">
   <p><select id="Kyouka"  onchange="sel1(this);"></select></p>
   <p><select id="Bunya" onchange="sel2(this);"></select></p>
   <p><select id="Tangen" onchange="sel3(this);"></select></p>
  </div>

  
  <div id="MainWindow"style="display:none">
    <div class="kokuban-s2">
      <p id="q_title"> 問題のタイトル</p>
      <p id="text_question" > 問題文</p>
    </div>
    
    <a href="#" onclick="Back();">もどる</a><br />
    </div>
  </div>

</body>
</html>
!

CSS 

              
                @charset 'utf-8'; /*文字コード指定*/


/*黒板風ウィンドウ*/
.kokuban-s2 {
    position: relative;
    margin-left: 15px ;
    margin-right: 15px ;
    padding: 0.5em;
    width: 90%; /* ボックス幅 */
    background: #006633; /* ボックス背景色 */
    color: #fff; /* 文章色 */
    border: 4px solid #b2771f; /* 枠線 */
    border-radius: 3px; /* 角の丸み */
    box-shadow: 0 0 5px #333, 0 0 5px #555 inset;
   }
   .kokuban-s2::before,
   .kokuban-s2::after {
    position: absolute;
    content: '';
    bottom: 0;
   } 
   .kokuban-s2::before {
    width: 20px; 
    right: 10px;
    border: solid 3px #ffff00; /*チョーク（黄色）*/
    border-radius: 3px 2px 0 2px;
   }
   .kokuban-s2::after {
    width: 15px; 
    right: 45px;
    border: solid 3px #fff; /*チョーク（白） */
    border-radius: 8px 5px 2px 5px;
   }
   .kokuban-s2 p {
    font-size: 1em; /*フォントサイズ指定(emはフォントの高さを１とした相対指定)*/
    margin-left: 2px; /*ボックス外側左の余白*/
}

/*問題表示*/
#q_title {
    font-size:1.2em;
    color:#ffff00;
}

#text_question {
    font-size:1.5em;
}

/*解答入力*/
.text-input {
    position: relative;
    margin-top: 60px;
    display: inline-block;
  }
  .text-input input[type="text"] {
    display: inline-block;
    width: 360px;
    font-size:1.5em;
    height: 60px;
    box-sizing: border-box;
    outline: none;
    border: 1px solid lightgray;
    border-radius: 3px;
    padding: 10px 10px 10px 100px;
    transition: all 0.1s ease-out;
  }
  .text-input input[type="text"] + label {
    position: absolute;
    font-size:1.5em;
    top: 0;
    left: 0;
    bottom: 0;
    height: 60px;
    line-height: 60px;
    color: white;
    border-radius: 3px 0 0 3px;
    padding: 0 20px;
    background: #E03616;
    -webkit-transform: translateZ(0) translateX(0);
            transform: translateZ(0) translateX(0);
    transition: all 0.3s ease-in;
    transition-delay: 0.2s;
  }
  .text-input input[type="text"]:focus + label {
    -webkit-transform: translateY(-110%) translateX(0%);
            transform: translateY(-110%) translateX(0%);
    border-radius: 3px;
    transition: all 0.1s ease-out;
  }
  .text-input input[type="text"]:focus {
    padding: 10px;
    transition: all 0.3s ease-out;
    transition-delay: 0.2s;
  }

/*セレクタ－*/
.select-box01 select {
	width: 100%;
    padding: 10px;
    margin: 10px;
	-webkit-appearance: none;
	-moz-appearance: none;
	appearance: none;
	border: 1px solid #999;
	background: #eee;
    background-size: 20px, 100%;
    font-size:1em;
    width: 50%;
    min-width:240px
       
}
!

JS 

              
                //教科の選択肢
var KyoukaArray = [
    {cd:"", label:"▼教科の選択"},
    {cd:"1", label:"算数"},
    {cd:"2", label:"理科"},
    {cd:"3", label:"社会"},
    {cd:"4", label:"国語"},
  ];
  var SansuArray = [//単元の選択肢
    {cd:"", label:"▼単元の選択"},
    {cd:"1", label:"和と差の文章題"},
    {cd:"2", label:"整数と規則性の文章題"},
    {cd:"3", label:"割合と比の文章題"},
    {cd:"4", label:"速さの文章題"},
    {cd:"5", label:"平面図形の計量"},
    {cd:"6", label:"相似・線分比と面積比"},
    {cd:"7", label:"立体図形の計量"},
    {cd:"8", label:"計算問題"},
  ];
  var RikaArray = [//分野の選択肢
    {cd:"", label:"▼分野の選択"},
    {cd:"11", label:"物理"},
    {cd:"12", label:"化学"},
    {cd:"13", label:"地学"},
    {cd:"14", label:"生物"},
  ];
  var ShakaiArray = [//分野の選択肢
    {cd:"", label:"▼分野の選択"},
    {cd:"21", label:"地理"},
    {cd:"22", label:"歴史"},
    {cd:"23", label:"公民"},
  ];
  var KokugoArray = [//分野の選択肢
    {cd:"", label:"▼分野の選択"},
    {cd:"31", label:"ないよ！"},
  ];
  var WasaArray = [//単元の選択肢
    {cd:"", label:"▼単元の選択"},
    {cd:"1", label:"和差算"},
    {cd:"2", label:"分配算"},
    {cd:"3", label:"つるかめ算"},
    {cd:"4", label:"差集め算・過不足算"},
    {cd:"5", label:"平均算"},
    {cd:"6", label:"集合算"}
  ];
  var ButuriArray = [//単元の選択肢
    {cd:"", label:"▼単元の選択"},
    {cd:"1", label:"ばね"},
    {cd:"2", label:"てこ・てんびん"},
    {cd:"3", label:"ものの運動"},
    {cd:"4", label:"滑車と輪軸"},
    {cd:"5", label:"圧力と浮力"},
  ];
  var KagakuArray = [//単元の選択肢
    {cd:"", label:"▼単元の選択"},
    {cd:"1", label:"空気と水の温度による変化"},
    {cd:"2", label:"もののあたたまりかた"},
    {cd:"3", label:"気体の性質"},
    {cd:"4", label:"水溶液の濃さ"},
    {cd:"5", label:"物の燃焼"},
    {cd:"6", label:"水溶液の性質(1)"},
  ];

//教科ボックスの生成
  window.onload=function(){
    for(var i=0;i<KyoukaArray.length;i++){
      let op = document.createElement("option");
      op.value =KyoukaArray[i].cd;
      op.text = KyoukaArray[i].label;
      document.getElementById("Kyouka").appendChild(op);
    }
  };
   
  //教科が選択された時に呼び出される処理
  function sel1(obj){
    var targetArr2;
    switch(obj.value){
      case '1':targetArr2 = SansuArray;break;
      case '2':targetArr2 = RikaArray;break;
      case '3':targetArr2 = ShakaiArray;break;
      case '4':targetArr2 = KokugoArray;break;
      default:targetArr2 = new Array();break;
    }
    var selObj2 = document.getElementById('Bunya');
    while(selObj2.lastChild){
      selObj2.removeChild(selObj2.lastChild);
    }
    for(var i=0;i<targetArr2.length;i++){
      let op = document.createElement("option");
      op.value = targetArr2[i].cd;
      op.text = targetArr2[i].label;
      selObj2.appendChild(op);
    }
  }

//分野が選択された時に呼び出される処理
  function sel2(obj){
    var targetArr3;
    switch(obj.value){
      case '1':targetArr3 =WasaArray;break;
      case '11':targetArr3 =ButuriArray;break;
      case '12':targetArr3 =KagakuArray;break;
      default:targetArr3 = new Array();;break;
    }
    var selObj3 = document.getElementById('Tangen');
    while(selObj3.lastChild){
      selObj3.removeChild(selObj3.lastChild);
    }
    for(var i=0;i<targetArr3.length;i++){
      let op = document.createElement("option");
      op.value = targetArr3[i].cd;
      op.text = targetArr3[i].label;
      selObj3.appendChild(op);
    }
  }
//単元が選択された時に呼び出される処理
function sel3(obj){
    var id1 = document.getElementById('Kyouka');
    var id2 = document.getElementById('Bunya');
    var id3 = document.getElementById('Tangen');
    QID = id1.value+id2.value%10+id3.value;
  document.getElementById("selecter").style.display="none";
  document.getElementById("text_question").innerHTML="今回の問題番号は"+QID;
  document.getElementById("MainWindow").style.display="inline";
}

function Back(){
  document.getElementById("selecter").style.display="inline";
  document.getElementById("MainWindow").style.display="none";
}
!
999px

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