jitsi-meet/css/_mini_toolbox.scss

.filmstrip-toolbox,
.always-on-top-toolbox {
    background-color: $newToolbarBackgroundColor;
    border-radius: 3px;
    display: flex;
    z-index: $toolbarZ;

    .toolbox-icon {
        cursor: pointer;
        padding: 7px;

        &.toggled {
            background: $AOTToolbarButtonToggleColor;
        }

        &.disabled {
            cursor: initial;
        }
    }
}

.always-on-top-toolbox {
    flex-direction: row;
    left: 50%;
    position: absolute;
    top: 10px;
    transform: translateX(-50%);

    .toolbox-button {
        &:first-child {
            .toolbox-icon {
                border-top-left-radius: 3px;
                border-bottom-left-radius: 3px;
            }
        }

        &:nth-child(2) {
            svg {
                fill: $hangupColor;
            }
        }

        &:last-child {
            .toolbox-icon {
                border-top-right-radius: 3px;
                border-bottom-right-radius: 3px;
            }
        }
    }
}

.filmstrip-toolbox {
    flex-direction: column;

    .toolbox-button {
        &:nth-child(1) {
            svg {
                fill: $hangupColor;
            }
        }

        .toolbox-icon {
            border-radius: 3px;
        }
    }
}