To change font sizes say for a title
<code>
h1 {font-size:1.2em; }
@media (min-width: 544px) {h1 {font-size:1.8em;}
@media (min-width: 768px) {h1 {font-size:2.5em;}
@media (min-width: 992px) {h1 {font-size:3em;}
@media (min-width: 1200px) {h1 {font-size:4em;}
</code>

Similarly if you decide to put a logo beside the title, make sure it is a bit responsive by putting, say
<code>
style="width:10%;height:auto;max-width:100%;"
</code>