.visually-hidden {
clip: rect(0 0 0 0);
clip-path: inset(100%);
width: 1px;
height: 1px;
overflow: hidden;
position: fixed;
white-space: nowrap;
width:
1px; }
最近はこっちのほうがよさそう
.visually-hidden {
position: fixed !important;
/* keep it on viewport */
top: 0px !important;
left: 0px !important;
/* give it non-zero size, VoiceOver on Safari requires at least 2 pixels
before allowing buttons to be activated. */
width: 4px !important;
height: 4px !important;
/* visually hide it with overflow and opacity */
opacity: 0 !important;
overflow: hidden !important;
/* remove any margin or padding */
border: none !important;
margin: 0 !important;
padding: 0 !important;
/* ensure no other style sets display to none */
display: block !important;
visibility: visible !important;
}