ngx-float-ui/css/theme-white.css

ngx-float-ui is an Angular wrapper for Floating UI

div.float-ui-container {
  background: white;
  color: black;
  border: 0;
  max-width: 250px;
  box-shadow: 0 3px 5px -1px rgba(0, 0, 0, 0.2), 0 5px 8px 0 rgba(0, 0, 0, 0.14), 0 1px 14px 0 rgba(0, 0, 0, 0.12);
  z-index: 999;
}
div.float-ui-container > .float-ui-arrow {
  background-color: white;
}