On mobile, plugin menu occludes content

I’ve not had a chance to put together a PR for this, but I’ve fixed it on my own site with custom CSS for now:

.admin-nav {
    position: static;
    float: none;
    width: 100%;
    font-size: 80%;
    margin: 0;
}

.admin-nav .nav-stacked {
    display: flex;
    flex-wrap: wrap;
}

.nav-stacked li {
    padding: 0;
    margin: 0;
}

.nav-stacked li a {
    padding: 5px 10px;
    font-size: 100%;
    line-height: auto;
}

.nav-stacked .active > a::after, .nav-stacked li > a.active::after {
    content: none;
}

.admin-detail {
    padding: 0;
}

…which produces something like this:

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