body {
  margin: 10px;
}

.file-uploader {
  /* make it invisible */
  opacity: 0;
  /* make it take the full height and width of the parent container */
  height: 50%;
  width:50%;
  cursor: pointer;
  /* make it absolute positioned */
  position: absolute;
  top: 0%;
  left: 0%;
}

.upload-icon {
  position: absolute;
  top: 45%;
  left: 50%;
  transform: translate(-50%, -50%);
  /* initial icon state */
  opacity: 0;
  transition: opacity 0.3s ease;
  color: #ccc;
  -webkit-text-stroke-width: 2px;
  -webkit-text-stroke-color: #bbb;
}

.profile-picture {
  opacity: 0.75;
  height: 150px;
  width: 150px;
  position: relative;
  overflow: hidden;

  /* default image */
  background: url('https://qph.cf2.quoracdn.net/main-qimg-f32f85d21d59a5540948c3bfbce52e68');

  background-position: center;
  background-repeat: no-repeat;
  background-size: cover;

  -webkit-background-size: cover;
  -moz-background-size: cover;
  -o-background-size: cover;

  -webkit-box-shadow: 0 8px 6px -6px black;
  -moz-box-shadow: 0 8px 6px -6px black;
  box-shadow: 0 8px 6px -6px black;
}

/* toggle icon state */
.profile-picture:hover .upload-icon {
  opacity: 1;
}