Blog post setting - align left, and max width
In blog post customizer, add css:

.blog-post-content {
max-width: 100%;
}
h2 {
font-size: 28px;
}
h3 {
font-size: 22px;
}
.blog-post-content img {
max-width: 350px;
}
.blog-post-comments-container {
max-width: 100%;
padding-top: 30px;
}
.blog-post-comments__form-container {
max-width: 50%;
margin-left: 0;
}
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