jitsi-meet/css/_lobby.scss

#lobby-screen {
    .content {

        .container {
            align-items: center;
            display: flex;
            flex-direction: column;

            .spinner {
                margin: 30px;
            }

            .joining-message {
                margin: 10px;
            }
        }
    }
}

#lobby-section {
    display: flex;
    flex-direction: column;

    .description {
        font-size: 13px;
    }

    .control-row {
        display: flex;
        flex-direction: row;
        justify-content: space-between;
        margin-top: 15px;

        label {
            font-size: 14px;
            font-weight: bold;
        }
    }
}

#notification-participant-list {
    background-color: $newToolbarBackgroundColor;
    border: 1px solid rgba(255, 255, 255, .4);
    border-radius: 8px;
    left: 0;
    margin: 20px;
    max-height: 600px;
    overflow: hidden;
    overflow-y: auto;
    position: fixed;
    top: 30px;
    z-index: $toolbarZ + 1;

    &.toolbox-visible {
        // Same as toolbox subject position
        top: 120px;
    }

    .title {
        background-color: rgba(0, 0, 0, .2);
        font-size: 1.2em;
        padding: 15px
    }

    button {
        align-self: stretch;
        margin: 8px 0;
        padding: 12px;
        transition: .2s transform ease;

        &:disabled {
            opacity: .5;
        }

        &:hover {
            transform: scale(1.05);

            &:disabled {
                transform: none;
            }
        }

        &.borderLess {
            background-color: transparent;
            border-width: 0;
        }

        &.primary {
            background-color: rgb(3, 118, 218);
            border-width: 0;
        }
    }
}

.knocking-participants-container {
    list-style-type: none;
    padding: 0 15px 15px 15px;
}

.knocking-participant {
    align-items: center;
    display: flex;
    flex-direction: row;
    margin: 8px 0;

    .details {
        display: flex;
        flex: 1;
        flex-direction: column;
        justify-content: space-evenly;
        margin: 0 30px 0 10px;
    }

    button {
        align-self: unset;
        margin: 0 5px;
    }
}

@media (max-width: 300px) {
    #knocking-participant-list {
        margin: 0;
        text-align: center;
        width: 100%;

        .avatar {
            display: none;
        }
    }

    .knocking-participant {
        flex-direction: column;

        .details {
            margin: 0;
        }
    }
}