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/*B&W*/
.bw {
  -webkit-transition: all 1s ease;
     -moz-transition: all 1s ease;
       -o-transition: all 1s ease;
      -ms-transition: all 1s ease;
          transition: all 1s ease;
}
 
.bw:hover {
  -webkit-filter: grayscale(100%);
}