copy-code-area.css

.copy-code {
    background-color: #3c3c3c;
    border-radius: 5px;
    padding: 7px;
    color: #ffffff;
    display: none;
    position: absolute;
    top: 15px;
    right: 15px;
    opacity: 50%;
    cursor: pointer;
    font-size: 15px
}
.copy-code:hover {
    opacity: 100%;
}
.pre-wrapper {
    position: relative;
}
.pre-wrapper:hover .copy-code {
    display: block;
}

pre::-webkit-scrollbar {
    width: 5px;
    height: 5px;
}

pre::-webkit-scrollbar-thumb {
    background: #666;
    border-radius: 20px;
}
pre::-webkit-scrollbar-track {
    background: #ddd;
    border-radius: 20px;
}