style.css

body {
    margin-top: 100px;
    background-color: #2d2d2d;
    font-family: Consolas, "Courier New", monospace;
    font-weight: normal;
    font-size: 16px;
    line-height: 20px;
    letter-spacing: 0px;
    font-feature-settings: "liga" off,"calt" off;
    color: #d4d4d4;
}

line {
    display: block;
    transition: 0.3s;
}

tab {
    padding-left: 2em;
    display: block;
}

a, u {
    color: inherit;
    text-decoration: none;
}

a:hover {
    background: #2d2d2d;
    transition: 0.3s;
}

span {
    transition: 0.3s;
}

span.blue {
    color: #569cd6;
}

span.green {
    color: #608b4e;
}

.panel {
    width: 80%;
    padding: 2px 16px;
    margin: 10px auto;
    border-radius: 4px;
    background: #1e1e1e;
    box-shadow: 0 8px 26px 8px rgba(0,0,0,0.2);
    transition: 0.3s;
}

@media screen and (max-width: 600px) {
    body {
        font-size: 12px;
        line-height: 16px;
    }
}

.clickable:hover {
    cursor: pointer;
    box-shadow: 0 8px 16px 0 rgba(0,0,0,0.2);
}