.wp-caption-text,
.wp-element-caption,
figcaption {
    position: absolute !important;
    left: -10000px !important;
    width: 1px !important;
    height: 1px !important;
    overflow: hidden !important;
    clip: rect(1px, 1px, 1px, 1px) !important;
    white-space: nowrap !important;
}