.toastui-editor-contents h1 {
    border-bottom: 0;
    font-size: 2rem;
    line-height: 1.6;
    margin: 48px 0 8px;
}
.toastui-editor-contents h2 {
    border-bottom: 0;
    font-size: 1.5rem;
    line-height: 1.6;
    margin: 36px 0 8px;
}
.toastui-editor-contents h3 {
    font-size: 1rem;
    line-height: 1.6;
    margin: 24px 0 8px;
}
.toastui-editor-contents ul li::before {
    position: absolute;
    top: 6px;
}