Justify-content: space-between works incorrect - html

Question

i have the following code
header {
width: 100%;
height: 65px;
background: #fff;
font-size: 11px;
font-weight: bold;
text-transform: uppercase;
display: flex;
justify-content: space-between;
align-items: center;
color: #252c3a;
}
#menu {
width: 100%;
display: flex;
margin-left: 28%;
}
#menu div {
width: 100px;
height: 65px;
display: flex;
align-items: center;
justify-content: center;
position: relative;
}
<header>
<div id="logo">
<img src="img/header/logo.png" alt="Logo">
</div>
<div id="menu">
<div>Home</div>
<div>Club-Life</div>
<div>Training</div>
<div>Instructors</div>
<div>Contact</div>
</div>
Chrome inspect
The width of the other blocks is 100%, but the header width gets bigger than the block below. I use justify-content: space-between.

Answer 1

Remove width & margin
Add flex-wrap on the header
header {
width: 100%;
height: 65px;
background: #fff;
font-size: 11px;
font-weight: bold;
text-transform: uppercase;
display: flex;
justify-content: space-between;
align-items: center;
color: #252c3a;
flex-wrap:wrap;
}
#menu {
display: flex;
flex-wrap:wrap;
}

Answer 2

There are few things we need to do:
In header:
1. Remove width
In #main:
1. Remove width
2. Remove margin
In #menu div:
1. Remove everything and just add margin left
Demo: https://codepen.io/Bibeva/pen/povddJr
Final code:
header {
height: 65px;
background: #fff;
font-size: 11px;
font-weight: bold;
text-transform: uppercase;
display: flex;
justify-content: space-between;
align-items: center;
color: #252c3a;
}
#menu {
display: flex;
}
#menu div {
margin: 0 0 0 30px;
}

Answer 3

#menu {
display: flex;
}
that's all , Can you try this ?