8 accordion menus created using only HTML/CSS
An accordion menu is recommended for situations such as "wanting to open/close when the user clicks" or "creating a Q&A list." This time, we have compiled design snippets for such an accordion. Everything introduced on this site uses the details tag, which is a great feature because it lets search engines know that the content is collapsible.
Simple accordion
With underline
Adjust design
Copy HTML
<details class="accordion-003">
<summary>アコーディオンのデザイン</summary>
<p>下線だけのシンプルなアコーディオンメニュー。クセがなくどんなサイトでも使いやすいのが特徴です。</p>
</details>
<details class="accordion-003">
<summary>アコーディオンのデザイン</summary>
<p>下線だけのシンプルなアコーディオンメニュー。クセがなくどんなサイトでも使いやすいのが特徴です。</p>
</details>
Copy CSS
.accordion-003 {
max-width: 500px;
margin-bottom: 7px;
border-bottom: 2px solid #d0d0d0;
}
.accordion-003 summary {
display: flex;
justify-content: space-between;
align-items: center;
position: relative;
padding: 1em 2em;
color: #333333;
font-weight: 600;
cursor: pointer;
}
.accordion-003 summary::-webkit-details-marker {
display: none;
}
.accordion-003 summary::after {
transform: translateY(-25%) rotate(45deg);
width: 7px;
height: 7px;
margin-left: 10px;
border-bottom: 3px solid #333333b3;
border-right: 3px solid #333333b3;
content: '';
transition: transform .3s;
}
.accordion-003[open] summary::after {
transform: rotate(225deg);
}
.accordion-003 p {
transform: translateY(-10px);
opacity: 0;
margin: 0;
padding: .3em 2em 1.5em;
color: #333333;
transition: transform .5s, opacity .5s;
}
.accordion-003[open] p {
transform: none;
opacity: 1;
}
With border
Adjust design
Copy HTML
<details class="accordion-004">
<summary>これはどのようなテンプレートですか？</summary>
<p>枠線付きのシンプルなアコーディオンメニューです。</p>
</details>
<details class="accordion-004">
<summary>どのような特徴がありますか？</summary>
<p>クセがなく、どんなサイトでも使いやすい汎用性があります。</p>
</details>
Copy CSS
.accordion-004 {
max-width: 500px;
margin-bottom: 7px;
border: 2px solid #d0d0d0;
border-radius: 5px;
}
.accordion-004 summary {
display: flex;
justify-content: space-between;
align-items: center;
position: relative;
padding: 1em 2em;
color: #333333;
font-weight: 600;
cursor: pointer;
}
.accordion-004 summary::-webkit-details-marker {
display: none;
}
.accordion-004 summary::after {
transform: translateY(-25%) rotate(45deg);
width: 7px;
height: 7px;
margin-left: 10px;
border-bottom: 3px solid #333333b3;
border-right: 3px solid #333333b3;
content: '';
transition: transform .3s;
}
.accordion-004[open] summary::after {
transform: rotate(225deg);
}
.accordion-004 p {
transform: translateY(-10px);
opacity: 0;
margin: 0;
padding: .3em 2em 1.5em;
color: #333333;
transition: transform .5s, opacity .5s;
}
.accordion-004[open] p {
transform: none;
opacity: 1;
}
With background color
Adjust design
Copy HTML
<details class="accordion-006">
<summary>これはどのようなテンプレートですか？</summary>
<p>背景色付きのシンプルなアコーディオンメニューです。</p>
</details>
<details class="accordion-006">
<summary>どのような特徴がありますか？</summary>
<p>クセがなく、どんなサイトでも使いやすい汎用性があります。</p>
</details>
Copy CSS
.accordion-006 {
max-width: 500px;
margin-bottom: 7px;
background-color: #f2f2f2;
border-radius: 5px;
}
.accordion-006 summary {
display: flex;
justify-content: space-between;
align-items: center;
position: relative;
padding: 1em 2em;
color: #333333;
font-weight: 600;
cursor: pointer;
}
.accordion-006 summary::-webkit-details-marker {
display: none;
}
.accordion-006 summary::after {
transform: translateY(-25%) rotate(45deg);
width: 7px;
height: 7px;
margin-left: 10px;
border-bottom: 3px solid #c2c2c2;
border-right: 3px solid #c2c2c2;
content: '';
transition: transform .3s;
}
.accordion-006[open] summary::after {
transform: rotate(225deg);
}
.accordion-006 p {
transform: translateY(-10px);
opacity: 0;
margin: 0;
padding: .3em 2em 1.5em;
color: #333333;
transition: transform .5s, opacity .5s;
}
.accordion-006[open] p {
transform: none;
opacity: 1;
}
White background & shadow
Adjust design
Copy HTML
<details class="accordion-008">
<summary>これはどのようなテンプレートですか？</summary>
<p>白背景にシャドウを付けたアコーディオンメニューです。</p>
</details>
<details class="accordion-008">
<summary>どのような特徴がありますか？</summary>
<p>シャドウのおかげで目立ちやすく、グレー系を背景色としている個所で使用するのがおすすめです。</p>
</details>
Copy CSS
.accordion-008 {
max-width: 500px;
margin-bottom: 10px;
border-radius: 5px;
box-shadow: 0 7px 15px -5px rgb(0 0 0 / 5%);
background-color: #fff;
}
.accordion-008 summary {
display: flex;
justify-content: space-between;
align-items: center;
position: relative;
padding: 1em 2em;
color: #333333;
font-weight: 600;
cursor: pointer;
}
.accordion-008 summary::-webkit-details-marker {
display: none;
}
.accordion-008 summary::after {
transform: translateY(-25%) rotate(45deg);
width: 7px;
height: 7px;
margin-left: 10px;
border-bottom: 3px solid #333333b3;
border-right: 3px solid #333333b3;
content: '';
transition: transform .3s;
}
.accordion-008[open] summary::after {
transform: rotate(225deg);
}
.accordion-008 p {
transform: translateY(-10px);
opacity: 0;
margin: 0;
padding: .3em 2em 1.5em;
color: #333333;
transition: transform .5s, opacity .5s;
}
.accordion-008[open] p {
transform: none;
opacity: 1;
}
Pretty accordion
Monochromatic background
Adjust design
Copy HTML
<details class="accordion-001">
<summary>アコーディオンのデザイン</summary>
<p>矢印付きのアコーディオン。開閉させると矢印が回転します。サイトのテーマカラーを背景色に設定するのがおすすめです。</p>
</details>
<details class="accordion-001">
<summary>アコーディオンのデザイン</summary>
<p>矢印付きのアコーディオン。開閉させると矢印が回転します。サイトのテーマカラーを背景色に設定するのがおすすめです。</p>
</details>
Copy CSS
.accordion-001 {
max-width: 500px;
background-color: #f2f2f2;
}
.accordion-001:not([open]) {
margin-bottom: 7px;
}
.accordion-001 summary {
display: flex;
justify-content: space-between;
align-items: center;
position: relative;
padding: 1em 2em;
border-radius: 5px;
background-color: #2589d0;
color: #fff;
font-weight: 600;
cursor: pointer;
}
.accordion-001 summary::-webkit-details-marker {
display: none;
}
.accordion-001 summary::after {
transform: translateY(-25%) rotate(45deg);
width: 7px;
height: 7px;
margin-left: 10px;
border-bottom: 3px solid #fff;
border-right: 3px solid #fff;
content: '';
transition: transform .3s;
}
.accordion-001[open] summary::after {
transform: rotate(225deg);
}
.accordion-001 p {
transform: translateY(-10px);
opacity: 0;
margin: 0;
padding: 1em 2em 2em 2em;
color: #333333;
transition: transform .5s, opacity .5s;
}
.accordion-001[open] p {
transform: none;
opacity: 1;
}
With border
Adjust design
Copy HTML
<details class="accordion-002">
<summary>アコーディオンのデザイン</summary>
<p>プラスマイナスの付きのアコーディオン。開閉させるとアイコンが回転します。枠線付きなので複数並べたい際におすすめです。</p>
</details>
<details class="accordion-002">
<summary>アコーディオンのデザイン</summary>
<p>プラスマイナスの付きのアコーディオン。開閉させるとアイコンが回転します。枠線付きなので複数並べたい際におすすめです。</p>
</details>
Copy CSS
.accordion-002 {
max-width: 500px;
margin-bottom: 7px;
border: 2px solid #2589d0;
border-radius: 5px;
}
.accordion-002 summary {
display: flex;
justify-content: space-between;
align-items: center;
position: relative;
padding: 1em 2em;
background-image: url('data:image/svg+xml;charset=utf8,%3Csvg%20xmlns%3D%22http%3A%2F%2Fwww.w3.org%2F2000%2Fsvg%22%20viewBox%3D%220%200%2028%2028%22%3E%0A%20%20%20%20%3Ccircle%20cx%3D%2214%22%20cy%3D%2214%22%20r%3D%2214%22%20style%3D%22fill%3A%232589d0%3B%22%2F%3E%0A%3C%2Fsvg%3E');
background-position: right calc(2em - 7px) center;
background-size: 22px;
background-repeat: no-repeat;
color: #2589d0;
font-weight: 600;
cursor: pointer;
}
.accordion-002 summary::-webkit-details-marker {
display: none;
}
.accordion-002 summary::after {
transform: translateY(-25%) rotate(45deg);
width: 5px;
height: 5px;
border-bottom: 3px solid #fff;
border-right: 3px solid #fff;
content: '';
transition: transform .3s;
}
.accordion-002[open] summary::after {
transform: rotate(225deg);
}
.accordion-002 p {
transform: translateY(-10px);
opacity: 0;
margin: 0;
padding: 0 2em 1.5em;
color: #333333;
transition: transform .5s, opacity .5s;
}
.accordion-002[open] p {
transform: none;
opacity: 1;
}
With background & like speech bubble
Adjust design
Copy HTML
<details class="accordion-007">
<summary>これはどのようなテンプレートですか？</summary>
<p>背景色付き&吹き出し風のアコーディオンメニューです。</p>
</details>
<details class="accordion-007">
<summary>どのような特徴がありますか？</summary>
<p>吹き出しのおかげで、より対話をしているような印象を与えます。</p>
</details>
Copy CSS
.accordion-007 {
max-width: 500px;
margin-bottom: 7px;
}
.accordion-007 summary {
display: flex;
justify-content: space-between;
align-items: center;
position: relative;
padding: 1em 2em;
border: 2px solid #2589d0;
border-radius: 5px;
color: #2589d0;
font-weight: 600;
cursor: pointer;
}
.accordion-007 summary::-webkit-details-marker {
display: none;
}
.accordion-007 summary::after {
transform: translateY(-25%) rotate(45deg);
width: 7px;
height: 7px;
border-bottom: 3px solid #2589d0;
border-right: 3px solid #2589d0;
content: '';
transition: transform .3s;
}
.accordion-007[open] summary::after {
transform: rotate(225deg);
}
.accordion-007 p {
position: relative;
transform: translateY(-10px);
opacity: 0;
margin-top: 20px;
padding: .8em 1.2em;
border: 2px solid #2589d0;
border-radius: 5px;
background-color: #fff;
color: #333333;
transition: transform .5s, opacity .5s;
}
.accordion-007[open] p {
transform: none;
opacity: 1;
}
.accordion-007 p::before,
.accordion-007 p::after {
position: absolute;
top: -15px;
left: 1.2em;
width: 30px;
height: 15px;
clip-path: polygon(50% 0, 0 100%, 100% 100%);
content: '';
}
.accordion-007 p::before {
background-color: #2589d0;
}
.accordion-007 p::after {
top: -12px;
background-color: #fff;
}
Like heading
Adjust design
Copy HTML
<details class="accordion-005">
<summary>これはどのようなテンプレートですか？</summary>
<p>見出し風のアコーディオンメニューです。</p>
</details>
<details class="accordion-005">
<summary>どのような特徴がありますか？</summary>
<p>目を引く可愛らしさとスタイリッシュさを兼ね備えています。</p>
</details>
Copy CSS
.accordion-005 {
max-width: 500px;
}
.accordion-005:not([open]) {
margin-bottom: 7px;
}
.accordion-005 summary {
display: flex;
justify-content: space-between;
align-items: center;
position: relative;
padding: 1em 2em;
border-left: 5px solid #2589d0;
background-color: #f2f2f2;
color: #333333;
font-weight: 600;
cursor: pointer;
}
.accordion-005 summary::-webkit-details-marker {
display: none;
}
.accordion-005 summary::after {
transform: translateY(-25%) rotate(45deg);
width: 7px;
height: 7px;
margin-left: 10px;
border-bottom: 3px solid #c2c2c2;
border-right: 3px solid #c2c2c2;
content: '';
transition: transform .3s;
}
.accordion-005[open] summary::after {
transform: rotate(225deg);
}
.accordion-005 p {
transform: translateY(-10px);
opacity: 0;
margin: 0;
padding: 1em 2em 2em 2em;
color: #333333;
transition: transform .5s, opacity .5s;
}
.accordion-005[open] p {
transform: none;
opacity: 1;
}