CSS Selector

.row {
  position: relative;
  padding: 18px 0;
  border-bottom: 1px solid #222;
  display: flex;
  align-items: center;
  min-height: 48px;
}
.row:last-child { border-bottom: none; }

.row::before {
  content: '';
  position: absolute;
  left: 0;
  right: 0;
  top: 50%;
  height: 1px;
  background: #262626;
  transform: translateY(-0.5px);
}

.square {
  position: relative;
  z-index: 1;
  width: 18px;
  height: 18px;
  background-color: var(--highlight-color);
  border-radius: 3px;
  will-change: transform;
}

.sq-lg { width: 28px; height: 28px; border-radius: 4px; }
.sq-md { width: 20px; height: 20px; border-radius: 3px; }
.sq-sm { width: 14px; height: 14px; border-radius: 3px; }

#css-selector-id { background-color: var(--accent-color); }

.demo-visual { padding: 26px 30px; background: #151515; }