.cropImageDialog {
    width: 500px;
    display: flex;
    flex-flow: column nowrap;
}

    .cropImageDialog #imageContainer {
        position: relative;
        margin-top: 15px;
    }

    .cropImageDialog #imageCrop {
        position: absolute;
        top: 50%;
        left: 50%;
        transform: translate(-50%, -50%);
    }