Accepted answer
.header-color {
background: #4AC29A;  /* fallback for old browsers */
background: -webkit-linear-gradient(to right, #BDFFF3, #4AC29A);  /* Chrome 10-25, Safari 5.1-6 */
background: linear-gradient(to right, #BDFFF3, #4AC29A); /* W3C, IE 10+/ Edge, Firefox 16+, Chrome 26+, Opera 12+, Safari 7+ */
z-index: -10


You can use className for Navigation and give that css For Example !
<Navigation className="inside-Drawer">
    <Link to="Resume">Resume</Link>`enter code here`
    <Link to="Aboutme">About Me</Link>
    <Link to="Projects">Projects</Link>                
    <Link to="Contact">Contact</Link>

    Css Codes

    text-align: center;
    background-image: url("your image http addres...");

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