Mezclar Imágenes

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<div class="multiImg"></div>  

<style>

.multiImg{
  border: 1px solid black;
  width: 300px;
  height: 300px; 
  background: 
  /* pez.jpg */
  url(https://th.bing.com/th/id/OIP.dDgDhV6Yy0eN8JBiZhC89gHaE8?pid=ImgDet&rs=1), 
  /* splash.png <-- imagen con transparencia */
  url(https://th.bing.com/th/id/OIP.icSFw3ZV7AWRjpYGpC2-DAHaGX?pid=ImgDet&rs=1);
  background-size: cover;
  background-position: center center;
  background-blend-mode: screen;
}

</style>