Bootstrap split vertical background 2 color and can't fill color on right side

Hi Guys. Maybe can help me? :confused:
I can’t delete vertical right background line and fill color #A9B1CC :confused: My project code

Do you mean line and background color of the navbar? If you do, this is code that is applying border to the navbar, you need to override it via your own styles.

.nav-tabs {
    border-bottom: 1px solid #ddd;


.nav-tabs>li>a:hover {
    border-color: #eee #eee #ddd;