jitsi_app_c0/css/modals/device-selection/_device-selection.scss

.device-selection {
    .device-selectors {
        font-size: 14px;

        > div {
            display: block;
            margin-bottom: 10px;
        }

        > div:last-child {
            margin-bottom: 5px;
        }

        .device-selector-icon {
            align-self: center;
            color: inherit;
            font-size: 20px;
            margin-left: 3px;
        }

        /* device-selector-trigger stylings attempt to mimic AtlasKit button */
        .device-selector-trigger {
            background-color: #0E1624;
            border: 1px solid #455166;
            border-radius: 5px;
            display: flex;
            height: 2.3em;
            justify-content: space-between;
            line-height: 2.3em;
            overflow: hidden;
            padding: 0 8px;
        }
        .device-selector-trigger-disabled {
            .device-selector-trigger {
                color: #a5adba;
                cursor: default;
            }
        }

        .device-selector-trigger-text {
            overflow: hidden;
            margin-left: 8px;
            text-overflow: ellipsis;
            white-space: nowrap;
            width: 100%;
        }
    }

    .device-selection-column {
        box-sizing: border-box;
        display: inline-block;
        vertical-align: top;

        &.column-selectors {
            margin-left: 15px;
            width: 45%;
        }

        &.column-video {
            width: 50%;
        }
    }

    .device-selection-video-container {
        border-radius: 3px;
        margin-bottom: 5px;

        .video-input-preview {
            margin-top: 2px;
            position: relative;

            > video {
                border-radius: 3px;
            }

            .video-input-preview-error {
                color: $participantNameColor;
                display: none;
                left: 0;
                position: absolute;
                right: 0;
                text-align: center;
                top: 50%;
            }

            &.video-preview-has-error {
                background: black;

                .video-input-preview-error {
                    display: block;
                }
            }

            .video-input-preview-display {
                height: auto;
                overflow: hidden;
                width: 100%;
            }
        }
    }

    .audio-output-preview {
        font-size: 14px;
        margin-top: 10px;

        a {
            color: 4C9AFF;
            cursor: pointer;
            text-decoration: none;
        }
    }

    .audio-input-preview {
        background: #7b7b7b;
        border-radius: 5px;
        height: 6px;

        .audio-input-preview-level {
            background: #4C9AFF;
            border-radius: 5px;
            height: 100%;
            -webkit-transition: width .1s ease-in-out;
            -moz-transition: width .1s ease-in-out;
            -o-transition: width .1s ease-in-out;
            transition: width .1s ease-in-out;
        }
    }
}