jitsi-meet/css/ringing/_ringing.scss

.ringing {
    display: block;
    left: 0;
    top: 0;
    width: 100%;
    height: 100%;
    position: fixed;
    z-index: $ringingZ;
    background: linear-gradient(transparent, #000);
    opacity: 0.8;

    &.solidBG {
        background: $defaultBackground;
        opacity: 1;
    }

    &__content {
        position: absolute;
        width: 400px;
        height: 250px;
        left: 50%;
        top: 50%;
        margin-left: -200px;
        margin-top: -125px;
        font-weight: 400;
        font-size: 14px;
        text-align: center;
    }

    &__avatar {
        width: 100px;
        height: 100px;
        border-radius: 50%;
    }

    &__caller-info {
        .mention {
            color: #333;
        }
    }
}