<!-- tpcms-form: {
  "label": "04_背景（1ページ1回のみ）",
  "category": "03_コンテンツ",
  "once": true,
  "fields": [
    { "key": "FILE", "type": "file", "label": "背景画像", "image_max_width": 2000, "image_quality": 82 }
  ]
} -->

<style>
body::before {
  background: linear-gradient(rgba(0, 0, 0, 0.5), rgba(0, 0, 0, 0.5)), url(./uploads/{{FILE}}) no-repeat center center / cover;
  content: "";
  display: block;
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100vh;
  z-index: -1;
}
</style>