Want logo to move 30 px downwards

Please help.My site is www.assurancegroup.co.uk.I want my site to move a bit downward.Please help.How can I do that?

I just checking your site, currently your site logo is already has 30px top padding, if you want to downwards the site logo (to the 60px), it will decrease the size of your site logo. You can try to add the following css code below using simple custom css plugin:

.site-logo {
    padding-top: 60px;

But I have thought that its better if you add a padding to the entire top bar, so your site logo will has the same size/dimention. (currently the top bar already has 20px top padding).

.site-header {
    padding-top: 50px;