.attachment img[src$=".svg"],
.widget_media_image img[src$=".svg"] {
    width: 100%
}

.attachment img[src$=".svg"],
.widget_media_image img[src$=".svg"] {
    width: 100%
}

.attachment svg,
.widget_media_image svg {
    max-width: 100%;
    height: auto
}