Help me in solving FASH04 problem

help
,
1

My issue

it shows background color not added.

My code

// your code goes here
*{
    margin: 0;
    padding: 0;
    font-family: Arial, sans-serif;
}

a{
    color: black;
    font-weight: 550;
    text-decoration: none;
}

/*  Update the code below this comment */
header{
    height: 60px;
    background-color:#806BDC;
    text-align: center;
}
.navbar{
    padding-top: 18px;
}
#navbar-title{
    color: white;
    font-size: 25px;
}

Learning course: Projects using HTML / CSS
Problem Link: Stylize Nav Bar Practice Problem in Projects using HTML / CSS