<div class="accordion-container">
  <details class="accordion-item">
    <summary class="accordion-title">Section 1 Title</summary>
    <div class="accordion-content">
      <p>Content for section 1. This area expands when the title is clicked, revealing more information.</p>
    </div>
  </details>
  <details class="accordion-item">
    <summary class="accordion-title">Section 2 Title</summary>
    <div class="accordion-content">
      <p>Content for section 2. You can put any HTML content here, such as text, images, or lists.</p>
    </div>
  </details>
</div>

body {
  font-family: Arial, sans-serif;
  padding: 20px;
  background-color: #f4f4f4;
}
.accordion-container {
  max-width: 600px;
  margin: 20px auto;
  background-color: #fff;
  border-radius: 8px;
  box-shadow: 0 2px 10px rgba(0,0,0,0.1);
  overflow: hidden; /* Ensures border-radius clips children */
}
.accordion-item {
  border-bottom: 1px solid #e0e0e0;
}
.accordion-item:last-child {
  border-bottom: none;
}
.accordion-title {
  padding: 15px 20px;
  font-weight: bold;
  cursor: pointer;
  outline: none; /* Remove default focus outline */
  display: flex;
  justify-content: space-between;
  align-items: center;
  transition: background-color 0.2s ease;
  color: #333;
}
.accordion-title:hover {
  background-color: #f9f9f9;
}
.accordion-title::after {
  content: '\002B'; /* Plus sign */
  font-size: 1.2em;
  transition: transform 0.3s ease;
}
.accordion-item[open] > .accordion-title {
  background-color: #e9e9e9;
}
.accordion-item[open] > .accordion-title::after {
  content: '\2212'; /* Minus sign */
  transform: rotate(180deg);
}
.accordion-content {
  padding: 15px 20px;
  background-color: #fff;
  line-height: 1.6;
  color: #555;
  border-top: 1px dashed #e0e0e0;
}
/* For smoother animation (optional) */
.accordion-item[open] .accordion-content {
  animation: fadeIn 0.5s ease;
}
@keyframes fadeIn {
  from { opacity: 0; transform: translateY(-10px); }
  to { opacity: 1; transform: translateY(0); }
}