Increasing the size of the logo can be done by simple custom CSS. Although providing any assistance for customized/extensive design or script coding is outside our item support, I can help you out with the CSS code because this is just a simple tweak. Kindly copy the CSS code below to your Custom CSS section (CROMA > Custom CSS).

/*Increase the size of the logo*/

.classic-menu > ul > li.logo a img {

    max-height: 58px;}

Kindly change the number (58) to increase the size of the logo. Also, make sure that the dimension of the logo you have uploaded is bigger than your max-height.