/*!
 * Start Bootstrap - Simple Sidebar (https://startbootstrap.com/template-overviews/simple-sidebar)
 * Copyright 2013-2019 Start Bootstrap
 * Licensed under MIT (https://github.com/BlackrockDigital/startbootstrap-simple-sidebar/blob/master/LICENSE)
 */

 @import url('https://fonts.googleapis.com/css2?family=Lexend+Deca:wght@100;200;300;400&display=swap');

 :root {
  --sidebar: #023047;
  --top: white;
  --orange: #FB8500;
}


.sidebar-group-title {
  display: block;
  width: 100%;
  text-align: right;
}

 body {
     font-family: 'Lexend Deca', sans-serif;
     background: #fafafa;
 }

body {
  overflow-x: hidden;
  
}

#sidebar-wrapper {
  min-height: 100vh;
  margin-left: -15rem;
  -webkit-transition: margin .25s ease-out;
  -moz-transition: margin .25s ease-out;
  -o-transition: margin .25s ease-out;
  transition: margin .25s ease-out;
  /* background-color: var(--sidebar)!important; */
  background-image: linear-gradient(var(--sidebar), #17202A);

}

.fixed-bottom .navbar {

  background-color: light;
  
}

.sticky-top .navbar {

  background-color: var(--top)!important;
  
}

#sidebar-wrapper .sidebar-heading {
  padding: 0.875rem 1.25rem;
  font-size: 1.2rem;
  background-color: var(--sidebar), 0!important;
  color: var(--orange);
  
}

#sidebar-wrapper .list-group-item {
  width: 15rem;
  background-color: var(--sidebar), 0!important;
  color: var(--orange);
}

#page-content-wrapper {
  min-width: 100vw;
  
}

#wrapper.toggled #sidebar-wrapper {
  margin-left: 0;
  
}

@media (min-width: 768px) {
  #sidebar-wrapper {
    margin-left: 0;
    
 
  }

  #page-content-wrapper {
    min-width: 0;
    width: 100%;
   
  }

  #wrapper.toggled #sidebar-wrapper {
    margin-left: -15rem;
    
  }
}

Farebný styling 

.bg-light {
  background-color: #86B3D1!important;
  color: white;
}

.btn-primary {
  color: white;
  background-color: var(--orange);
  border-color: var(--orange);
}

.btn-primary:hover, .btn-primary:focus, .btn-primary:active, .btn-primary.active, .open>.dropdown-toggle.btn-primary {
  color: #fff;
  background-color: var(--sidebar)!important;
  border-color: var(--sidebar)!important; /*set the color you want here*/
}

.nav-link {
  color: var(--sidebar)!important;
}

.list-group-item.text-end {
  text-align: right;
}