.markdown-body .task-list-item {
    list-style-type: none !important;
}

.markdown-body .task-list-item input[type="checkbox"] {
    margin: 0 4px 0.25em -20px;
    vertical-align: middle;
}

.md-grid {
    max-width: 80%; /* or 100%, if you want to stretch to full-width */
}

.mermaid {
    text-align: center;
}