I don’t know what the header looked like before, so I’ll have to ask if the logo image previously overlapped the orange/yellow line like it currently does. And I also assume the menu was below the logo and not above. Was the menu also under the orange/yellow line?
You can try adding these three rules to the end of your child theme’s style.css file:
#header {
height: 80px;
}
.logo {
top: 10px;
}
#primary_menu {
top: 20px;
}
The values listed are what is currently in effect. The first rule will adjust the height of the header area (the part above the orange/yellow line). The second rule determines how far from the top of the screen the logo should be placed. The third rule determines how far from the top of the screen the menu should be placed.
If the menu should go below the orange/yellow line, then try setting the value for top to 80px in the third rule.
If both the logo and menu should go above the orange/yellow line, then increase the height of the header to about 140px and the top of the menu to 80px.