html {
    scrollbar-gutter: stable;
}

header {
    align-items: center;
    width: 100vw;
    max-width: 100vw;
    background-color: lightgrey;
    flex: 1; 
    /* total flex = 13 */
}

.navlink {
    display: flex;
    flex: 1;
    align-items:center;
    justify-content:center;
}

.inner-header {
    display: flex;
    flex-direction: row;
    width: 100%;
    height: 100%;
    align-items: center;
    justify-content: center;
    background-color: lightgrey;
}

body {
    display: flex;
    flex-direction: column;
    margin: 0;
    height: 100vh;
    width: 100vw;
    overflow: hidden;
}

div {
    background-color: lightgrey;
}