index.css

.navbar{ 
    background:#0079bf;
}

.nav-link , .navbar-brand{
     color: #f4f4f4 !important;
     border-radius: 5px;
}

.nav-link{ 
    margin-right: 1em !important;
}

.nav-link:hover , .navbar-brand:hover{ 
    background: #f4f4f4; color: #0079bf !important; 
    
}

.navbar-collapse{ 
    justify-content: flex-end;
}
.navbar-toggler{  
    background:#fff !important;
}



.header{
    background-color: #5caad8;
    background-attachment: fixed;
    background-size: cover;
    background-position: center;
    height: 100vh;
   
   }

.l{
    position: relative;
    top:10%;
}