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.soliloquy-container .soliloquy-video-icon { 
  background-image: url('http://www.example.com/image.png') !important; 
  background-size: 50% 50% !important; 
}

/* Retina version */
@media only screen and (-webkit-min-device-pixel-ratio: 2), 
only screen and (min--moz-device-pixel-ratio: 2), 
only screen and (-o-min-device-pixel-ratio: 2 / 1), 
only screen and (min-device-pixel-ratio: 2), 
only screen and (min-resolution: 192dpi), 
only screen and (min-resolution: 2dppx) {
  .soliloquy-container .soliloquy-video-icon { 
    background-image: url('http://www.example.com/image@2x.png') !important; 
    background-size: 50px 50px !important; 
  }
}