コピペでできるアコーディオン機能のデザインサンプル一覧[HTML/CSS]

<details class="t8-accordion-1">
    <summary>アコーディオン</summary>
    <p>アコーディオンの中身</p>
</details>

.t8-accordion-1 {
    max-width: 200px;
    margin-bottom: 5px;
}

.t8-accordion-1 summary {
    display: flex;
    align-items: center;
    position: relative;
    padding: .5em;
    color: #fff;
    cursor: pointer;
    font-weight: bold;
}

.t8-accordion-1 p {
    opacity: 0;
    margin: 0;
    padding: .5em;
    color: #fff;
    transform: translateY(-10px);
    transition: transform 1s, opacity 1s;
}

.t8-accordion-1[open] p {
    transform: none;
    opacity: 1;
}

<details class="t8-accordion-2">
    <summary>アコーディオン</summary>
    <p>アコーディオンの中身</p>
</details>

.t8-accordion-2 {
    max-width: 200px;
    margin-bottom: 5px;
    border-left: 3px solid #808080;
}

.t8-accordion-2 summary {
    display: flex;
    align-items: center;
    position: relative;
    padding: .5em;
    color: #fff;
    cursor: pointer;
    font-weight: bold;
}

.t8-accordion-2 p {
    opacity: 0;
    margin: 0;
    padding: .5em;
    color: #fff;
    transform: translateY(-10px);
    transition: transform 1s, opacity 1s;
}

.t8-accordion-2[open] p {
    transform: none;
    opacity: 1;
}

<details class="t8-accordion-3">
    <summary>アコーディオン</summary>
    <p>アコーディオンの中身</p>
</details>

.t8-accordion-3 {
    max-width: 200px;
    margin-bottom: 5px;
    border-bottom: 3px solid #808080;
}

.t8-accordion-3 summary {
    display: flex;
    align-items: center;
    position: relative;
    padding: .5em;
    color: #fff;
    cursor: pointer;
    font-weight: bold;
}

.t8-accordion-3 p {
    opacity: 0;
    margin: 0;
    padding: .5em;
    color: #fff;
    transform: translateY(-10px);
    transition: transform 1s, opacity 1s;
}

.t8-accordion-3[open] p {
    transform: none;
    opacity: 1;
}

<details class="t8-accordion-4">
    <summary>アコーディオン</summary>
    <p>アコーディオンの中身</p>
</details>

.t8-accordion-4 {
    max-width: 200px;
    margin-bottom: 5px;
    border: 3px solid #808080;
}

.t8-accordion-4 summary {
    display: flex;
    align-items: center;
    position: relative;
    padding: .5em;
    color: #fff;
    cursor: pointer;
    font-weight: bold;
}

.t8-accordion-4 p {
    opacity: 0;
    margin: 0;
    padding: .5em;
    color: #fff;
    transform: translateY(-10px);
    transition: transform 1s, opacity 1s;
}

.t8-accordion-4[open] p {
    transform: none;
    opacity: 1;
}

<details class="t8-accordion-5">
    <summary>アコーディオン</summary>
    <p>アコーディオンの中身</p>
</details>

.t8-accordion-5 {
    max-width: 200px;
    margin-bottom: 5px;
    background: #0d6efd;
}

.t8-accordion-5 summary {
    display: flex;
    align-items: center;
    position: relative;
    padding: .5em;
    color: #fff;
    cursor: pointer;
    font-weight: bold;
}

.t8-accordion-5 p {
    opacity: 0;
    margin: 0;
    padding: .5em;
    color: #fff;
    transform: translateY(-10px);
    transition: transform 1s, opacity 1s;
}

.t8-accordion-5[open] p {
    transform: none;
    opacity: 1;
}

<details class="t8-accordion-6">
    <summary>アコーディオン</summary>
    <p>アコーディオンの中身</p>
</details>

.t8-accordion-6 {
    max-width: 200px;
    margin-bottom: 5px;
    background: #0d6efd;
    border-radius: 10px;
}

.t8-accordion-6 summary {
    display: flex;
    align-items: center;
    position: relative;
    padding: .5em;
    color: #fff;
    cursor: pointer;
    font-weight: bold;
}

.t8-accordion-6 p {
    opacity: 0;
    margin: 0;
    padding: .5em;
    color: #fff;
    transform: translateY(-10px);
    transition: transform 1s, opacity 1s;
}

.t8-accordion-6[open] p {
    transform: none;
    opacity: 1;
}

<details class="t8-accordion-7">
    <summary>アコーディオン</summary>
    <p>アコーディオンの中身</p>
</details>

.t8-accordion-7 {
    max-width: 200px;
    margin-bottom: 5px;
    background: #0d6efd;
    border-radius: 30px;
}

.t8-accordion-7 summary {
    display: flex;
    align-items: center;
    justify-content: center;
    position: relative;
    padding: .5em;
    color: #fff;
    cursor: pointer;
    font-weight: bold;
}

.t8-accordion-7 p {
    opacity: 0;
    margin: 0;
    padding: .5em;
    color: #fff;
    transform: translateY(-10px);
    transition: transform 1s, opacity 1s;
}

.t8-accordion-7[open] p {
    transform: none;
    opacity: 1;
    text-align: center;
}

<details class="t8-accordion-8">
    <summary><i class="fa fa-bars"></i>　アコーディオン</summary>
    <p>アコーディオンの中身1</p>
    <p>アコーディオンの中身2</p>
    <p>アコーディオンの中身3</p>
</details>

.t8-accordion-8 {
    max-width: 200px;
    margin-bottom: 5px;
}

.t8-accordion-8 summary {
    display: flex;
    align-items: center;
    position: relative;
    padding: .5em;
    color: #fff;
    cursor: pointer;
    font-weight: bold;
}

.t8-accordion-8 p {
    opacity: 0;
    margin: 0;
    padding: .5em;
    color: #fff;
    transform: translateY(-10px);
    transition: transform 1s, opacity 1s;
}

.t8-accordion-8[open] p {
    transform: none;
    opacity: 1;
    background: #0d6efd;
    margin-bottom: 5px;
}