discourse/app/assets/stylesheets/desktop/upload.scss

.upload-selector {
  label {
    display: inline-block;
    padding-left: 10px;
  }
  .radios {
    height: 60px;
    .inputs {
      float: right;
      width: 75%;
      input {
        width: 90%;
        margin: 0 0 5px 0;
      }
      input[type="file"] {
        font-size: 14px;
        line-height: 18px;
      }
      .description, .hint {
        color: $primary;
      }
      .hint {
        font-style: italic;
        margin: 5px 0 0 0;
      }
    }
  }
  .radios:last-child {
    height: 20px;
  }
}

.uploaded-image-preview {
  height: 270px;
  background-position: center center;
  background-size: cover;
  background-color: $primary;
}

.image-upload-controls {
  padding: 10px;
}