.preview-image {
    width: 300px;
    height: 300px;
    position: relative;
    overflow: hidden;
    background-color: #ffffff;
    color: #ecf0f1;
  }
.preview-image input {
    line-height: 200px;
    font-size: 200px;
    position: absolute;
    opacity: 0;
    z-index: 10;
  }
.preview-image label {
    position: absolute;
    z-index: 5;
    opacity: 0.8;
    cursor: pointer;
    background-color: #bdc3c7;
    width: 200px;
    height: 50px;
    font-size: 20px;
    line-height: 50px;
    text-transform: uppercase;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    margin: auto;
    text-align: center;
  }

  .mandatory-field {
    color : red;
  }