client/src/sass/player/offline-notification.scss
$height: 40px;
.vjs-peertube-offline-notification {
position: absolute;
top: 0;
left: 0;
right: 0;
height: $height;
color: #000;
background-color: var(--mainColorLightest);
text-align: center;
z-index: 1;
display: flex;
justify-content: center;
align-items: center;
}