Effortless Installation Black Junction Box 4-Pack with V0 Flame Resistance

Here is the complete product description in HTML format with Schema.org markup, designed to be natural, readable, and fully optimized for e-commerce display.
“`html

* {
margin: 0;
padding: 0;
box-sizing: border-box;
}

body {
background: #f4f6f9;
font-family: ‘Segoe UI’, Roboto, system-ui, -apple-system, sans-serif;
display: flex;
justify-content: center;
padding: 40px 20px;
}

.product-card {
max-width: 1100px;
width: 100%;
background: #ffffff;
border-radius: 28px;
box-shadow: 0 20px 40px rgba(0, 0, 0, 0.08), 0 8px 20px rgba(0, 0, 0, 0.04);
padding: 32px 36px;
transition: all 0.2s ease;
}

/* Schema wrapper */
.product-schema {
display: contents;
}

/* —- image gallery —- */
.gallery {
display: flex;
flex-wrap: wrap;
gap: 20px;
margin-bottom: 30px;
align-items: flex-start;
}

.gallery-main {
flex: 2 1 380px;
background: #fafbfc;
border-radius: 24px;
padding: 20px;
border: 1px solid #eef0f2;
display: flex;
justify-content: center;
}

.gallery-main img {
width: 100%;
max-width: 420px;
height: auto;
object-fit: contain;
border-radius: 16px;
}

.gallery-thumbs {
flex: 1 1 160px;
display: flex;
flex-direction: row;
flex-wrap: wrap;
gap: 12px;
align-items: center;
}

.gallery-thumbs img {
width: 70px;
height: 70px;
object-fit: cover;
border-radius: 16px;
border: 2px solid transparent;
background: #fff;
box-shadow: 0 2px 8px rgba(0,0,0,0.04);
cursor: default;
transition: border 0.15s;
}

.gallery-thumbs img:hover {
border-color: #1a73e8;
}

/* —- product header —- */
.product-header {
display: flex;
flex-wrap: wrap;
justify-content: space-between;
align-items: flex-start;
margin-bottom: 18px;
}

.product-title {
font-size: 28px;
font-weight: 600;
letter-spacing: -0.3px;
color: #0b1a2e;
max-width: 700px;
line-height: 1.2;
}

.product-price {
font-size: 32px;
font-weight: 700;
color: #0b6e4f;
background: #e9f3ef;
padding: 8px 20px;
border-radius: 60px;
white-space: now