Ghost/ghost/admin/app/styles/addons/gh-koenig/koenig-toolbar-blockitem.css

.toolbar-block {
    position: absolute;
    margin: 0;
    background-color: #fff;
    border:1px var(--lightgrey) solid;
    transition: margin-left 0.1s;
}


.toolbar-block ul {
    list-style: none;
    margin: 0;
    padding: 0;
}

.toolbar-block ul li {
    margin:0;
    padding: 0;
    width:0;
    opacity:0;
    overflow:hidden;
    transition: width 0.3s;
    float:left;
}

.toolbar-block ul li:first-child {
    display:block;
    width:32px;
    opacity:0.3;
}

.toolbar-block:hover ul li {
    display:block;
    width:32px;
    opacity:0.3;
    animation-delay: 2s;
    transition: width 0.3s;
}

.toolbar-block ul li.selected {
    display:block;
    opacity:0.1;
    width:32px;
}


.toolbar-block:hover ul li.selected {
    opacity:1;
}


.toolbar-block ul li button {
    border-radius: 2px;
    font-family: var(--font-family);
    font-size: 10px;
    line-height: 15px;
    text-transform: uppercase;
    padding:0;
    margin:0;
    height:32px;
    min-width:32px;
    color: var(--darkgrey);
    background-color: #fff;
    border: none;
    transition: 0.3s;
}

.toolbar-block ul li.primary button {
    opacity:1;
}

.toolbar-block ul li:hover {
    opacity:1;
}

.toolbar-block ul li:hover button, .toolbar-block ul li.selected button {
    background-color: var(--lightgrey);
    color: var(--darkgrey);
    transition: 0.3s;
}

.toolbar-block ul li button img {
    width:20px;
    height:20px;
}

/**flag **/
.toolbar-block ul li button label {
    display:none;
}

.toolbar-block ul li:hover button:hover label {
    display:block;
    position:absolute;
    margin-top:20px;
    transform:translateX(calc(-50% + 16px));

    white-space: nowrap;
    background-color: #5ba4e5;
    border-radius: 3px;
    padding:5px 10px 5px 10px;
    color: #FFF;
    -webkit-animation: fade-in 0.333s;
    animation: fade-in 0.333s;

}
.toolbar-block ul li button:hover label:before {
    content: '';
    position: absolute;

    left: 50%;
    top: -9px;

    margin-left: -10px;

    border-bottom: 10px solid #5ba4e5;
    border-left: 10px solid transparent;
    border-right: 10px solid transparent;
}