.toolbar {
    position: fixed;
    top: 0;
    left: 0;
    z-index: 101001;
    height: 100%;
    display: flex;
    flex-flow: column;
    box-sizing: border-box;
    visibility: hidden;
    overflow-y: scroll;
}

.toolbar.is-shown {
    visibility: visible;
}

.toolbar > .group {
    border-radius: 0.5rem;
    margin-left: 0.25rem;
    margin-right: 0.25rem;
}

.toolbar > .group + .group,
.toolbar > .group:first-child {
    margin-top: 0.25rem;
}

.toolbar > .group:last-child {
    margin-bottom: 0.25rem;
}

.toolbar > .group > div {
    width: 2.5rem;
    height: 2.5rem;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.5rem;
    cursor: pointer;
    border-radius: 0.5rem;
    transition: all 0.3s ease-out;
    transition-property: background-color;
}

.toolbar > .group > div + div {
    margin-top: 0.25em;
}

.toolbar > .group > div.is-disabled,
.toolbar > .group > div.is-disabled:hover,
.toolbar.is-locked > .group > div,
.toolbar.is-locked > .group > div:hover {
    cursor: default;
    background-color: transparent;
}