Hi there,
Uppercase to normal case (what you type is what you get):
h1, h2, h3, h4, h5, h6 {
text-transform: none;
}
On the navigation buttons, you would need to create a child theme and then copy over the /inc/templates-tags.php file and edit the following section and chang ehte Next Post and Previous Post text in the span tags.
<nav class="navigation post-navigation" role="navigation">
<h1 class="screen-reader-text"><?php _e( 'Post navigation', 'intergalactic' ); ?></h1>
<div class="nav-links">
<?php
previous_post_link( '<div class="nav-previous">%link</div>', _x( '<span class="meta-nav">←</span> Previous Post', 'Previous post link', 'intergalactic' ) );
next_post_link( '<div class="nav-next">%link</div>', _x( 'Next Post <span class="meta-nav">→</span>', 'Next post link', 'intergalactic' ) );
?>
If you have not yet done so, I would suggest creating a child theme so that any customizations you make will not be overwritten by a future theme update. Alternately you can use the Edit CSS function in the Jetpack plugin, or use one of the other Custom CSS plugins that will keep CSS changes from being overwritten.
Child Themes
Child Theme creation plugins
Jetpack plugin
Custom CSS plugins
To widen the blog post area, add the following to your custom CSS and edit the width.
.page-content, .entry-content, .entry-summary, .entry-title, .entry-footer, .comments-area, .site-info, .entry-author, .entry-meta, .page-title, .taxonomy-description {
width: 660px;
}
To add a logo image instead of the text, add the following CSS and replace URL_OF_IMAGE between the quote marks with the URL of your uploaded logo. This may require additional adjustments depending on logo size.
.single .site-title a, .error404 .site-title a, .search-no-results .site-title a {
color: rgba(0, 0, 0, 0) !important;
background: url('URL_OF_IMAGE') no-repeat scroll right top transparent;
}
On the footer text, I see you have added text using CSS and the .site-info:before pseudo selector. Did this achieve what you wanted?