pre[class*="language-"] {
    position: relative;
    overflow: visible;
    border-radius: 5px;
    /*            overflow: scroll;*/
}

pre[class*="language-"] .copy {
    content: "copy";
    padding: 2px 10px 0;
    position: absolute;
    top: 0;
    right: 0;
    /*transform: translate(-10px, 0%);*/
    border-top-left-radius: 3px;
    border-top-right-radius: 3px;
    color: white;
    /*background: #272822;*/
    cursor: pointer;
    display: none ;
    transition: opacity 1s ease-out;
    z-index: 0;
}

pre[class*="language-"]:hover .copy {
    /*transform: translate(-10px, -95%);*/
    display: block;
    background: #272822;
    transition: display 600ms; 
    z-index: 1;
    animation: pulse 3s infinite;
}
@keyframes pulse {
    0% {
        background-color: #001F3F;
    }
    100% {
        background-color: #FF4136;
    }
}

pre[class*="language-"]:hover .copy:hover {
    color: gray;
}

.bdt-source-code pre {
    max-height:  500px;
    overflow: auto;
}