gnu-social/public/assets/css/right/right.css

.icon-right {
    position: fixed;
    top: 0;
    right: 0;
    padding: calc(3 * var(--unit-size));

    width: var(--main-size);
    height: auto;

    fill: var(--white);
    stroke-width: 0;
    vertical-align: middle;
}

#right-container > div {
    opacity: 0;
}
#right-container[open] > div {
    opacity: 100%;
}
#right-container[open] {
    order: 3;
    border-left: solid 1px var(--bg2);
}

#right-panel {
    display: flex;
    flex-direction: column;
}