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

body {
  width: 100vw;
  height: 100vh;
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
  gap: 10px;
  padding: 10px;
  place-items: center;
}
div {
  min-height: 300px;
  min-width: 300px;
  mask-size: 200px 200px;
  mask-repeat: no-repeat;
  border: 1px solid #efefef;
  padding: 2px;
  border-radius: 4px;
  box-shadow: 0px 0px 2px rgba(0,0,0,.3);
}

div:nth-child(1) {
  background: url('//www.w3cplus.com/sites/default/files/blogs/2019/1905/3-1G11R02533.jpg') no-repeat;
}

div:nth-child(2) {
  background: radial-gradient(circle at center, #000, #000 30%, transparent 30%, transparent 100% );
}

div:nth-child(3) {
  background: url('//www.w3cplus.com/sites/default/files/blogs/2019/1905/3-1G11R02533.jpg') no-repeat;
  mask-image: radial-gradient(circle at center, #000, #000 30%, transparent 30%, transparent 100% );
  mask-position: left top;
}

div:nth-child(4) {
  background: url('//www.w3cplus.com/sites/default/files/blogs/2019/1905/3-1G11R02533.jpg') no-repeat;
  mask-image: radial-gradient(circle at center, #000, #000 30%, transparent 30%, transparent 100% );
  mask-position: right top;
}

div:nth-child(5) {
  background: url('//www.w3cplus.com/sites/default/files/blogs/2019/1905/3-1G11R02533.jpg') no-repeat;
  mask-image: radial-gradient(circle at center, #000, #000 30%, transparent 30%, transparent 100% );
  mask-position: right bottom;
}

div:nth-child(6) {
  background: url('//www.w3cplus.com/sites/default/files/blogs/2019/1905/3-1G11R02533.jpg') no-repeat;
  mask-image: radial-gradient(circle at center, #000, #000 30%, transparent 30%, transparent 100% );
  mask-position: left bottom;
}

div:nth-child(7) {
  background: url('//www.w3cplus.com/sites/default/files/blogs/2019/1905/3-1G11R02533.jpg') no-repeat;
  mask-image: radial-gradient(circle at center, #000, #000 30%, transparent 30%, transparent 100% );
  mask-position: center;
}

div:nth-child(8) {
  background: url('//www.w3cplus.com/sites/default/files/blogs/2019/1905/3-1G11R02533.jpg') no-repeat;
  mask-image: radial-gradient(circle at center, #000, #000 30%, transparent 30%, transparent 100% );
  mask-position: left center;
}

div:nth-child(9) {
  background: url('//www.w3cplus.com/sites/default/files/blogs/2019/1905/3-1G11R02533.jpg') no-repeat;
  mask-image: radial-gradient(circle at center, #000, #000 30%, transparent 30%, transparent 100% );
  mask-position: right center;
}
div:nth-child(10) {
  background: url('//www.w3cplus.com/sites/default/files/blogs/2019/1905/3-1G11R02533.jpg') no-repeat;
  mask-image: radial-gradient(circle at center, #000, #000 30%, transparent 30%, transparent 100% );
  mask-position: center top;
}

div:nth-child(11) {
  background: url('//www.w3cplus.com/sites/default/files/blogs/2019/1905/3-1G11R02533.jpg') no-repeat;
  mask-image: radial-gradient(circle at center, #000, #000 30%, transparent 30%, transparent 100% );
  mask-position: center bottom;
}
div:nth-child(12) {
  background: url('//www.w3cplus.com/sites/default/files/blogs/2019/1905/3-1G11R02533.jpg') no-repeat;
  mask-image: radial-gradient(circle at center, #000, #000 30%, transparent 30%, transparent 100% );
  mask-position: right 3em bottom 10px;
}