<h2>使用するSVG画像</h2>
<img src="https://nonosso.net/code-sample/mask_220513.svg" alt="SVG" />

<div class="grid">
  <div class="accent"><p>単色</p></div>
  <div class="accent accent-gradient"><p>グラデーション</p></div>
</div>

.grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1rem;
  margin-top: 1rem;
  
  >div {
    display: grid;
    place-items: center;
    height: 150px;
    background-color: #f1f1f1;
    color: #333;
    
    >* {
      position: relative;
      z-index: 10;
    }
  }
}

.accent {
  position: relative;
  
  &::before {
    position: absolute;
    z-index: 0;
    content: '';
    top: 0; right: 0;
    width: 166px; height: 82px;
    background: rosybrown;
    mask: url(https://nonosso.net/code-sample/mask_220513.svg) no-repeat;
  }
}

.accent-gradient {
  &::before {
    background: linear-gradient(135deg, darkseagreen 0%, rosybrown 100%); 
  }
}