div.code-toolbar {
    position: relative;
}

    div.code-toolbar > .toolbar {
        position: absolute;
        z-index: 10;
        top: .3em;
        right: .2em;
        transition: opacity 0.3s ease-in-out;
        opacity: 0;
    }

    div.code-toolbar:hover > .toolbar {
        opacity: 1;
    }

    /* Separate line b/c rules are thrown out if selector is invalid.
   IE11 and old Edge versions don't support :focus-within. */
    div.code-toolbar:focus-within > .toolbar {
        opacity: 1;
    }

    div.code-toolbar > .toolbar > .toolbar-item {
        display: inline-block;
    }

        div.code-toolbar > .toolbar > .toolbar-item > a {
            cursor: pointer;
        }

        div.code-toolbar > .toolbar > .toolbar-item > button {
            background: none;
            border: 0;
            color: inherit;
            font: inherit;
            line-height: normal;
            overflow: visible;
            padding: 0;
            -webkit-user-select: none; /* for button */
            -moz-user-select: none;
            -ms-user-select: none;
        }

        div.code-toolbar > .toolbar > .toolbar-item > a,
        div.code-toolbar > .toolbar > .toolbar-item > button,
        div.code-toolbar > .toolbar > .toolbar-item > span {
            color: #bbb;
            font-size: .8em;
            padding: 0 .5em;
            background: #f5f2f0;
            background: rgba(224, 224, 224, 0.2);
            box-shadow: 0 2px 0 0 rgba(0,0,0,0.2);
            border-radius: .5em;
        }

            div.code-toolbar > .toolbar > .toolbar-item > a:hover,
            div.code-toolbar > .toolbar > .toolbar-item > a:focus,
            div.code-toolbar > .toolbar > .toolbar-item > button:hover,
            div.code-toolbar > .toolbar > .toolbar-item > button:focus,
            div.code-toolbar > .toolbar > .toolbar-item > span:hover,
            div.code-toolbar > .toolbar > .toolbar-item > span:focus {
                color: inherit;
                text-decoration: none;
            }