@alegna01, if you have not already taken a look at the information on the child theme page for the WordPress codex, please take a look at it here.
For the two different links, the menu area looks very different. From what I saw on the link you included, you have to modify the styles on your child theme for the items below (what it look like the theme is using to color in the whole header) and edit the lines that are bold.
site-header .site-introduction {
text-align: center;
position: relative;
display: block;
/* background-color: #150E0E; */
max-width: 320px;
min-height: 86px;
margin: 0 auto;
background: white;
<strong>background: linear-gradient(0deg, transparent 0px, #fff 0) top right, linear-gradient(90deg, transparent 0px, #000 0) top left, linear-gradient(315deg, transparent 30px, #fff 0) bottom right, linear-gradient(45deg, transparent 30px, #fff 0) bottom left;</strong>
background-size: 50% 50%;
background-repeat: no-repeat;
padding-top: 10px;
z-index: 3000;
}
body.custom-background {
<strong>background-color: #000;</strong>
}
#topbar_container {
margin: 0 auto;
width: 100%;
<strong> background-color: #000;</strong>
height: 60px;
}
Please note that you do not need to add every portion of the class or id but you do have to put the modified code in there. Hope this helps.