Motivation: in the single post page, the arrow that points to the next post appears one line below the ‘Next’ text in Safari and Chrome browsers.
Solution: I don’t know if this is a ‘good’ way to solve it or if I should report it somewhere, but as a quick fix I’ve edited my child style.css file adding the following:

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#nav-single .nav-next {    
    float:right;
}
#nav-single .nav-previous {
    float:left;
}  

#nav-single .nav-next {    
    float:right;
}
#nav-single .nav-previous {
    float:left;
}