runasjs-prismjs-plugin/css/runAsJs.css

runJavascript is a prism js plugin which will run the javascript inside the code block.

.customConsole {
    background-color: #393838;
    padding: 0.5rem;
    border-radius: 6px;
    position: relative;
}

.output-close {
    color: #bbb;
    font-size: .8em;
    padding: 0 0.5em;
    background: #f5f2f0;
    background: rgba(224, 224, 224, .2);
    box-shadow: 0 2px rgb(0 0 0 / 20%);
    border-radius: 0.5em;
    cursor:pointer;
    border-style: none;
}

.output-close:hover {
    color: whitesmoke;
    text-decoration: none;
}