CybroAddons/image_capture_upload_widget/static/src/scss/image_capture.scss

.o_field_image {
    background-color: var(--ImageField-background-color, transparent);

    button {
        transition: opacity ease 400ms;
        width: 26px;
        height: 26px;
    }

    .o_mobile_controls {
        button {
            width: 30px;
            height: 30px;
            padding: 6px !important;
        }
    }
}