写真フィルター ドット

HTML

<div class="pic">
  <img src="picture.jpg" alt="カフェ店内の写真">
</div>

CSS

.pic {
  position: relative;
}
.pic img {
  display: block;
}

.pic::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background-image: radial-gradient(rgba(201 72 31 / .6) 30%, rgba(0 0 0 / 0) 31%), radial-gradient(rgba(201 72 31 / .6) 30%, rgba(0 0 0 / 0) 31%);
  background-size: 6px 6px;
  background-position: 0 0, 3px 3px;
}