Vivaldi Tab Loading Indicator

common.css

/* append this to the bottom of the common.css file */
/* via https://forum.vivaldi.net/topic/6289/tab-loading-indicator/24?page=2 */
@keyframes fade{
    from {opacity:1}
    to {opacity:0.4}
}
/* Either pulse the "X"... */
.button-toolbar.reload.loading svg{
    animation-name: fade;
    animation-duration: 400ms;
    animation-iteration-count: infinite;
    animation-timing-function: ease-in-out;
    animation-direction:alternate;
}
/* ...or pulse the addressbar: */
.addressfield .progressing{
    animation-name: fade;
    animation-duration: 400ms;
    animation-iteration-count: infinite;
    animation-timing-function: ease-in-out;
    animation-direction:alternate;
}