Lyrical Theme home page

Hi,
I just installed the lyrical theme on my website http://www.kalifilms.in. I am not a pro in this but I have a little experience from years back.

I have been trying in vain to do some changes to the home page.

1) The picture which appears as the header is way too thick (height?). I went on to Chrome -> Inspect element and this is what it is:

<header id=”masthead” class=”site-header” role=”banner”>

If I add inside chrome a tag then it comes to my desired height:
<header id=”masthead” class=”site-header” role=”banner” style=”
height: 400px;
“>

But I just can’t seem to figure out how to change it in my style.css in wordpress. There is nothing called masthead or the above code.

2) The text on the header: “Your production partner in India” comes as two lines and this too is very low and again as the above point making the opening page too thick.

Any way I can fix the two above ? And where should I be looking to edit these.

Can you guys help me out ? Thanks in Advance.

Varun