public/admin/scss/modules/_select-media-box.scss
.select-media-box {
  display: inline-block;
  max-width: 100%;
  position: relative;
  img {
    border: 1px solid #c2cad8;
    max-height: 400px;
  }
  .remove-image {
    opacity: 0;
    background-color: #ccc;
    border-radius: 50% !important;
    display: block;
    height: 30px;
    position: absolute;
    right: -15px;
    top: 20px;
    width: 30px;
    transition: all 0.15s ease-in-out 0s;
    transform: rotate(45deg);
    span {
      width: 20px;
      height: 1px;
      background-color: #000;
      display: block;
      position: absolute;
      top: 50%;
      left: 50%;
      transform: translate(-50%, -50%);
      &:before {
        content: '';
        display: block;
        width: 1px;
        height: 20px;
        background-color: #000;
        position: absolute;
        top: 50%;
        left: 50%;
        transform: translate(-50%, -50%);
      }
    }
    &:hover {
      opacity: 1;
    }
  }
  .show-add-media-popup:not(.btn):hover {
    ~ .remove-image {
      opacity: 1;
    }
  }
}
#select_media_modal {
  .modal-body {
    padding: 0;
    .iframe-container {
      min-width: 1000px;
      width: 100%;
      min-height: 420px;
      height: 420px;
    }
  }
  iframe {
    width: 100%;
    height: 100%;
    border: 0 none;
  }
}