回答編集履歴
3
三角形の高さを調整
    
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            三角形だけ二重線にするのは案外難しい。
         
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            以下のCSSを使って、`div`要素に`class="balloon"`を指定すると、こんな感じ。
         
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            補足: 三角形部分をより小さくするために、rotateとscaleYで変形させた。この変形により細く見えてしまう三角形部分のborderの太さや位置も微調整。
         
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            ↓
         
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            ```CSS
         
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            .balloon {
         
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                position: relative;
         
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                height: 80px;
         
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                width: 400px;
         
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                color: black;
         
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                background: white;
         
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                border: 2px lightblue solid;
         
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            }
         
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            .balloon:before {
         
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                content: "";
         
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                position: absolute;
         
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                top: 100%;
         
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                left: 50%;
         
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                margin-left: -5px;
         
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                height: 20px;
         
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                width: 20px;
         
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                background: inherit;
         
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                transform: scaleY(0.5) rotate(45deg);
         
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                transform-origin: top right;
         
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            }
         
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            .balloon:after {
         
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                content: "";
         
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                position: absolute;
         
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                top: 100%;
         
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                left: 50%;
         
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                margin-top: 3px;
         
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                margin-left: -7px;
         
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                height: 20px;
         
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                width: 20px;
         
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                background: transparent;
         
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                transform: scaleY(0.5) rotate(45deg);
         
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                transform-origin: top right;
         
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                border-bottom: 8px lightblue double;
         
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                border-right: 8px lightblue double;
         
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            }
         
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            .balloon * {
         
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                text-align: center;
         
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            }
         
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            ```
         
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2
CSSを誤ペーストしていたのを修正
    
        answer	
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         @@ -4,5 +4,45 @@ 
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            ```CSS
         
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            .balloon {
         
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              position: relative;
         
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              height: 80px;
         
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              width: 400px;
         
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              color: black;
         
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              background: white;
         
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              border: 2px lightblue solid;
         
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            }
         
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            .balloon:before {
         
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              content: "";
         
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              position: absolute;
         
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              top: 100%;
         
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              left: 50%;
         
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              margin-left: -5px;
         
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              height: 20px;
         
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              width: 20px;
         
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              background: inherit;
         
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              transform: rotate(45deg);
         
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              transform-origin:top right;
         
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            }
         
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            .balloon:after {
         
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              content: "";
         
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              position: absolute;
         
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              top: 100%;
         
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              left: 50%;
         
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              margin-top: 4px;
         
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              margin-left: -7px;
         
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              height: 20px;
         
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              width: 20px;
         
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              background: transparent;
         
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              transform: rotate(45deg);
         
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              transform-origin:top right;
         
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            -
             
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              border-bottom: 6px lightblue double;
         
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              border-right: 6px lightblue double;
         
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            }
         
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            .balloon * {
         
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              text-align: center;
         
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            }
         
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            ```
         
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1
三角形の位置を微調整
    
        answer	
    CHANGED
    
    | 
         @@ -1,48 +1,8 @@ 
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       1 
1 
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            三角形だけ二重線にするのは案外難しい。
         
     | 
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       2 
2 
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            以下のCSSを使って、`div`要素に`class="balloon"`を指定すると、こんな感じ。
         
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       3 
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            ```CSS
         
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            .balloon {
         
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              position: relative;
         
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              height: 80px;
         
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              width: 400px;
         
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              color: black;
         
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            -
              background-color: white;
         
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            -
              border: 2px lightblue solid;
         
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            }
         
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            .balloon:before {
         
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              content: "";
         
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              position: absolute;
         
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              top: 100%;
         
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              left: 50%;
         
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              margin-left: -12px;
         
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              height: 20px;
         
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              width: 20px;
         
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              background-color: inherit;
         
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              transform: rotate(45deg);
         
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              transform-origin:top right;
         
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            }
         
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            .balloon:after {
         
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              content: "";
         
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              position: absolute;
         
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              top: 100%;
         
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              left: 50%;
         
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              margin-top: 4px;
         
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              margin-left: -14px;
         
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              height: 20px;
         
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              width: 20px;
         
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              background: transparent;
         
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              transform: rotate(45deg);
         
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              transform-origin:top right;
         
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            folder_name = tkinter.filedialog.askdirectory(initialdir=iDir)
         
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              border-right: 6px lightblue double;
         
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            }
         
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            .balloon * {
         
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              text-align: center;
         
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            }
         
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            ```
         
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