web/web_widget_image_download/static/src/scss/web_widget_image_download.scss

.o_field_widget {
    &.o_field_image {
        .o_form_image_controls {
            > .fa, .o_form_binary_file_download {
                margin: 5px 0;
                padding: 1px 0;
                width: 33.333333%;
            }
            .o_form_binary_file_download {
                border: none;
                background-color: transparent;
                line-height: 0px;

                > button.fa {
                    width: 100%;
                    height: 100%;
                    margin: 0px;
                    border: none;
                    background-color: transparent;
                    cursor: pointer;
                }
            }
        }
        @include media-breakpoint-down(xs, $o-extra-grid-breakpoints) {
            .o_form_image_controls{
                .o_form_binary_file_download {
                    display: none;
                }
                > .fa{
                    width: 50%;
                    padding: 6px;
                    margin: 0px;
                }
            }
        }
    }
}