How to Target Padding and Margin and Add Color to Navigation Tool

Site URL: https://www.designsbyalexina.com/

Hello!

I have three questions about the navigation tool.   I have attached an image for the current website and what I want it to look like. 

1. I would like to make the navigation bar extend all the way to the edge of the screen. 

2. I would like to make a navigation colored bar below the brand logo. 

3. I would like to add a png file of a logo sun marker.  I understand I need to upload it to css but not how to tell the program to move it....

THANK YOU! 

Add to Design > Custom CSS

/* colored nav bar */
.header .header-announcement-bar-wrapper {
    padding-left: 0;
    padding-right: 0;
}
.header-layout-branding-center-nav-center .header-title-nav-wrapper {
    margin-left: 0;
    flex: 0 0 100%;
}
.header-nav {
    background: #ffdea1;
    padding-top: 10px;
    padding-bottom: 10px;
}

This worked! THANK YOU!!!!! 🤩