ManageIQ/manageiq-ui-classic

.miq-toast-wrapper {
  position: fixed;
  top: 20px;
  right: 20px;
  z-index: 10000;
  width: calc(34% - 20px);
  max-height: calc(100% - 40px);
  overflow-y: auto;
  max-width: 50%;
  min-width: 30%;
}