Hueman Borders

Hello Community

i hope that my post is in the right forum for my question, i apologies me when it is wrong.

i have the problem that i dont became the borders away at the header menu and pictures. I dont wont any border there but everything what i try dosent works.

ob here my spezifikations:
theme: Hueman
website : http://www.cio2go.de

code style.css:
#nav-topbar .nav li a {

color: #000 !important;
font-weight: 400;
font-size: 0.6em;
}
#nav-header{
margin-left: 15.2%;

}
.nav-wrap container {
border: 0;
}
#nav-header .nav li a {
color: #000;
font-weight: 600;
font-size: 0.9em;
}
#nav-header .nav li li a {
color: #000;
font-weight: 500;
font-size: 0.8em;
}
#nav-topbar .nav {
text-align: right;
}

.full-width.admin-bar #nav-topbar.nav-container {
text-align: right !important;
}

#nav-header {
text-align: left !Important;
}

That is my current Style.css out of my child theme.

My thanks gos tto all people that try to help me.

MFG
Dacki