css 测试

2. css 测试

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;
}