/* 1) Make the blog/posts index full-width and center it */
body.home .site-content,
body.home #primary {
  max-width: 1200px;        /* or whatever max-width you prefer */
  margin: 0 auto;           /* center it */
  padding: 0 20px;          /* optional horizontal padding */
}

/* 2) (Optional) Hide the default “Blog” headline at the top */
body.home .page-header,
body.home .entry-header {
  display: none;
}