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CSSだけで作る超軽量アコーディオン開閉「続きを読む」「もっと読む」「more read」(スマホ対応)

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Kobito.mKwpoC.png

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デモ

jsbin

html

<div class="accordion-box">
  <input id="ac00" type="checkbox">
  <label for="ac00"></label>
  <div class="accordion-container">
    <h3>タイトル</h3>
    <p>世界中どこを探してもなかったので作りました。</p>
    <p>jsを使っていないのでコンフリクトすることはありません。</p>
    <p>スマホにも対応。iPhone4くらいの小さい画面でも大丈夫です。</p>
    <p>閉じるボタンは要らないときは「.accordion-box input:checked + label」のdisplay:noneを有効にしてください。</p>
  </div><!— accordion-container -->
</div><!— accordion-box -->

css

.accordion-box {
    position: relative;
}
.accordion-box label {
    height: 140px; /* グラデーションの高さ */
    cursor: pointer;
    text-align: center;
    font-size: 12px;
    position: absolute;
    bottom: 0;
    width: 100%;

    /* 以下グラデーションは「背景が白」に併せて設定しています */ 
    background: -webkit-linear-gradient(top, rgba(255, 255, 255, 0) 0%, rgba(255, 255, 255, 0.95) 90%);
    background: -moz-linear-gradient(top, rgba(255, 255, 255, 0) 0%, rgba(255, 255, 255, 0.95) 90%);
    background: -o-linear-gradient(top, rgba(255, 255, 255, 0) 0%, rgba(255, 255, 255, 0.95) 90%);
    background: -ms-linear-gradient(top, rgba(255, 255, 255, 0) 0%, rgba(255, 255, 255, 0.95) 90%);
    background: linear-gradient(to bottom, rgba(255, 255, 255, 0) 0%, rgba(255, 255, 255, 0.95) 90%);
}
.accordion-box input:checked + label {
    background: inherit; /* 開いた時には背景グラデーションを消す */
}
.accordion-box label:after {
    content: "続きをよむ"; /* ラベルの文字 */
    letter-spacing: .05em;
    line-height: 2.5rem;
    position: absolute;
    bottom: 20px;
    left: 50%;
    -webkit-transform: translate(-50%, 0);
    transform: translate(-50%, 0);
    color: #fff;
    background-color: #000;
    width: 18.75rem;
    -webkit-border-radius: 20px;
    -moz-border-radius: 20px;
    border-radius: 20px;
}
.accordion-box label:before {
    content: "↓";
    font-weight: 700;
    position: absolute;
    bottom: 30px;
    left: 50%;
    -webkit-transform: translate(-140px, 0);
    transform: translate(-140px, 0);
    background-color: #fff;
    z-index: 1;
    -webkit-border-radius: 100%;
    -moz-border-radius: 100%;
    border-radius: 100%;
    width: 20px;
    height: 20px;
    line-height: 20px;
}
.accordion-box input {
    display: none;
}
.accordion-box .accordion-container {
    overflow: hidden;
    height: 200px; /* 開く前に見えている部分の高さ */
    -webkit-transition: all 0.1s;
    -moz-transition: all 0.1s;
    -ms-transition: all 0.1s;
    -o-transition: all 0.1s;
    transition: all 0.1s;
}


.accordion-box input:checked + label {
    /* display: none ; 閉じるボタンは要らないとき */
}
.accordion-box input:checked + label:after {
    content: "閉じる";
}
.accordion-box input:checked + label:before {
    content: "↑";
}
.accordion-box input:checked ~ .accordion-container {
    height: auto;
    padding-bottom: 80px; /* 閉じるボタンのbottomからの位置 */
    -webkit-transition: all 0.1s;
    -moz-transition: all 0.1s;
    -ms-transition: all 0.1s;
    -o-transition: all 0.1s;
    transition: all 0.1s;
}


関連

こちらも同じ原理で作っています。
CSSだけで作る超軽量ポップアップモーダルウインドウ(スマホ対応)

dangoya
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