header {
    display: flex;
    flex-direction: row;
    justify-content: space-between;
}

.title_togglebutton{
    display: flex;
    justify-content:space-between;
}

header h1 a {
    display: block;
    box-sizing:border-box;
    height: 100%;
    width: 100%;
    padding: 1.1rem 1rem 0 4rem;
}

#toggle_menu_button {
    display: none;
}

nav {
    flex-grow: 0.5;
}
.nav-list {
    display: flex;
    flex-direction: row;
    height: 100%;
}
.nav-item {
    list-style-type: none;
    flex-grow: 10;
    height: 100%;
    margin: 0;
}
.nav-item a {
    display: block;
    text-align: center;
    box-sizing: border-box;
    height: 100%;
    width: 100%;
    padding-top: 1.25rem;
}

@media (max-width: 60em) {

    #toggle_menu_button {
        display: block;
        padding: 1rem 2rem;
        margin: 0;
        cursor: pointer;
    }

    header {
        flex-direction: column;
        height: auto;
        min-height: 4rem;
    }

    .nav-list {
        flex-direction: column;
        height: 8rem;
    }

    .nav-list li {
        width: 100%;
    }
}