IfcOpenShell/src/blenderbim/blenderbim/bim/data/webui/static/css/styles.css

body {
    font-family: Arial, sans-serif;
    margin: 0;
    padding: 20px;
}

.message {
    margin-bottom: 10px;
    padding: 10px;
    border: 1px solid #ccc;
    border-radius: 5px;
}