body > header {
    grid-row-start: 1;
    grid-row-end: 2;
    grid-column-start: 2;
    grid-column-end: 3;

    display:flex;
    align-items: center;
}

.logo {
    width: 50px;
    height: 50px;
    padding: 0 50px;

    display: flex;
    align-items: center;
}

.logo > a:after {
    content: '';
}

.logo > a > img {
    width: 50px;
}

body > header > nav {
    display: flex;
    flex-grow: 2;
    justify-content: flex-end;
}

body > header {
    grid-row-start: 1;
    grid-row-end: 2;
    grid-column-start: 2;
    grid-column-end: 3;

    display:flex;
    align-items: center;
}

.logo {
    width: 50px;
    height: 50px;
    padding: 0 50px;

    display: flex;
    align-items: center;
}

.logo > a:after {
    content: '';
}

.logo > a > img {
    width: 50px;
}

body > header > nav {
    display: flex;
    flex-grow: 2;
    justify-content: flex-end;
}

body > header > nav > a{
    margin-left: 10px;
}

Add margint o header nav
Add margint o header nav
