text-generation-webui/css/html_readable_style.css

.container {
    max-width: 600px;
    margin-left: auto;
    margin-right: auto;
    background-color: rgb(31, 41, 55);
    padding:3em;
}

.container p {
    font-size: 16px !important;
    color: white !important;
    margin-bottom: 22px;
    line-height: 1.4 !important;
}