Fix new GitHub UI (redue maximum width of navbar)

styles.css

.application-main {
    max-width: 1180px;
    margin: 0 auto;
}

* {
    border-radius: 0 !important;
    box-shadow: none !important;
}

.Counter {
    border-radius: 0.8em !important;
}

.btn {
    border-radius: 0.33em !important;
}

.pagehead {
    background-color: white !important;
}

.UnderlineNav {
    background-color: white !important;
}