Customizing Mobile Menu Icon

Is it possible to alter the menu icon to be smaller and thicker?

Add to Home > Design > Custom CSS

.burger-inner:after, .burger-inner:before {
    width: 70%;
}

That seems to work.  

However, when it transforms in to 'X', it seems to move the the left while being bigger, instead of both having a common center point.

Can you share link to your site?

Link

How are you able to have a full black background when the menu pops up? I am struggling with that on my site, it seems to be transparent and its hard to read. 

thiscitymaps.com 

15 hours ago, thiscitymaps said:

How are you able to have a full black background when the menu pops up? I am struggling with that on my site, it seems to be transparent and its hard to read.

thiscitymaps.com 

Custom CSS:

.header .header-announcement-bar-wrapper:not(.shrink):not(.transparent-header-theme--override) {
   -webkit-backdrop-filter: none;
   backdrop-filter: none;
}

.tweak-transparent-header:not(.header--menu-open) .header-announcement-bar-wrapper {
   background-color: rgba(0,0,0,0.9);
}