JavaScript不要！CSSだけで作るインタラクティブなUI

<div class="hover-card">
  <h3>Hover Me!</h3>
  <p>This is an interactive card.</p>
</div>

.hover-card {
  width: 300px;
  padding: 20px;
  border-radius: 10px;
  background: white;
  box-shadow: 0 4px 10px rgba(0, 0, 0, 0.1);
  transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.hover-card:hover {
  transform: translateY(-10px);
  box-shadow: 0 8px 20px rgba(0, 0, 0, 0.2);
}

<div class="tabs-horizontal">
  <input type="radio" id="tab1" name="tab" checked>
  <label for="tab1">Tab 1</label>
  <input type="radio" id="tab2" name="tab">
  <label for="tab2">Tab 2</label>
  <div class="content" id="content1">This is the content for Tab 1.</div>
  <div class="content" id="content2">This is the content for Tab 2.</div>
</div>

/* タブ全体のスタイル */
.tabs-horizontal {
  margin: 0 auto;
}

/* 横並びのタブ */
.tabs-horizontal label {
  display: inline-block;
  width: 50%; /* 各タブを均等に */
  padding: 10px 20px;
  text-align: center;
  cursor: pointer;
  background: #f0f0f0;
  border: 2px solid #ddd;
  font-weight: bold;
  transition: background 0.3s;
  border-radius: 5px 5px 0px 0px;
  padding: 10px 20px 10px 20px !important;
  border-bottom: initial;
}

/* ラジオボタンを非表示 */
.tabs-horizontal input[type="radio"] {
  display: none;
}

/* 選択されたタブのスタイル */
.tabs-horizontal input[type="radio"]:checked + label {
  background: #cf5f5f;
  border: 2px solid #cf5f5f;
  border-bottom: initial;
}

/* コンテンツのデフォルトは非表示 */
.tabs-horizontal .content {
  display: none;
  padding: 20px;
  background: #fafafa;
  border: 1px solid #ddd;
  border-top: none;
}

/* 選択されたタブに対応するコンテンツを表示 */
#tab1:checked ~ #content1,
#tab2:checked ~ #content2 {
  display: block;
}

<div class="accordion">
  <input type="checkbox" id="section1">
  <label for="section1">Section 1</label>
  <div class="content">This is the content for Section 1.</div>

  <input type="checkbox" id="section2">
  <label for="section2">Section 2</label>
  <div class="content">This is the content for Section 2.</div>
</div>

.accordion input[type="checkbox"] {
  display: none;
}

.accordion label {
  display: block;
  padding: 10px;
  background: #6a11cb;
  color: white;
  border: 1px solid #ddd;
  cursor: pointer;
}

.accordion .content {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.3s ease;
  background: #f9f9f9;
  padding: 0 10px;
}

.accordion input[type="checkbox"]:checked + label + .content {
  max-height: 100px;
}

<div class="spinner"></div>

.spinner {
  width: 40px;
  height: 40px;
  border: 4px solid #f3f3f3;
  border-top: 4px solid #6a11cb;
  border-radius: 50%;
  animation: spin 1s linear infinite;
}

@keyframes spin {
  from {
    transform: rotate(0deg);
  }
  to {
    transform: rotate(360deg);
  }
}