MediaWiki:Gadget-ringbell.css

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@keyframes ring {
    0% { transform: rotate(0); }
    1% { transform: rotate(30deg); }
    3% { transform: rotate(-28deg); }
    5% { transform: rotate(34deg); }
    7% { transform: rotate(-32deg); }
    9% { transform: rotate(30deg); }
    11% { transform: rotate(-28deg); }
    13% { transform: rotate(26deg); }
    15% { transform: rotate(-24deg); }
    17% { transform: rotate(22deg); }
    19% { transform: rotate(-20deg); }
    21% { transform: rotate(18deg); }
    23% { transform: rotate(-16deg); }
    25% { transform: rotate(14deg); }
    27% { transform: rotate(-12deg); }
    29% { transform: rotate(10deg); }
    31% { transform: rotate(-8deg); }
    33% { transform: rotate(6deg); }
    35% { transform: rotate(-4deg); }
    37% { transform: rotate(2deg); }
    39% { transform: rotate(-1deg); }
    41% { transform: rotate(1deg); }
    43% { transform: rotate(0); }
    100% { transform: rotate(0); }
}
#pt-notifications-alert .mw-echo-notifications-badge:not(.mw-echo-notifications-badge-all-read)::before {
    animation: ring 5s 0.5s ease-in-out infinite;
}