/* Remove the diamond/gradient around the sidebar collapse button by overlaying a solid ivory diamond using a pseudo-element. */
.custom-menu .btn::before, #sidebarCollapse.btn::before, #sidebarCollapse.btn.btn-primary::before {
  content: '';
  position: absolute;
  left: 50%;
  top: 50%;
  width: 70px;
  height: 70px;
  background: #FFFFF0;
  transform: translate(-50%, -50%) rotate(45deg);
  z-index: 0;
  border-radius: 16px;
  box-shadow: none;
}

.custom-menu .btn, #sidebarCollapse.btn, #sidebarCollapse.btn.btn-primary {
  position: relative;
  z-index: 1;
}

.custom-menu .fa-bars, #sidebarCollapse .fa-bars {
  position: relative;
  z-index: 2;
}