bootstrap-like.css

.c-notifications {
  position: fixed;
  padding: 0.5rem 1rem;
  width: 50vw;
  right: 0;
  bottom: 0;
  z-index: 1;
}

.c-notifications__item {
  margin: 0.5rem 0;
  display: flex;
  box-sizing: border-box;
  background-color: #fefefe;
  color: #636464;
  border: 1px solid #e8e8e8;
  border-radius: 0.25rem;
}

.c-notifications__item.primary {
  color: #084298;
  background-color: #cfe2ff;
  border-color: #b6d4fe;
}

.c-notifications__item.secondary {
  color: #41464b;
  background-color: #e2e3e5;
  border-color: #d3d6d8;
}

.c-notifications__item.success {
  color: #0f5132;
  background-color: #d1e7dd;
  border-color: #badbcc;
}

.c-notifications__item.danger {
  color: #842029;
  background-color: #f8d7da;
  border-color: #f5c2c7;
}

.c-notifications__item.warning {
  color: #664d03;
  background-color: #fff3cd;
  border-color: #ffecb5;
}

.c-notifications__item.info {
  color: #055160;
  background-color: #cff4fc;
  border-color: #b6effb;
}

.c-notifications__item.dark {
  color: #141619;
  background-color: #d3d3d4;
  border-color: #bcbebf;
}

.c-notifications__item__message {
  flex-grow: 1;
  padding: 1em 0 1em 1em;
}

.c-notifications__item__close {
  padding: 1em;
  flex-shrink: 0;
  cursor: pointer;
  opacity: 0.5;
}

.c-notifications__item__close::after {
  content: '';
  display: block;
  width: 1em;
  height: 1em;
  background-color: currentColor;
  mask-image: url('data:image/svg+xml,%3Csvg xmlns%3D%22http%3A%2F%2Fwww.w3.org%2F2000%2Fsvg%22 viewBox%3D%220 0 16 16%22%3E%3Cpath d%3D%22M.293.293a1 1 0 011.414 0L8 6.586 14.293.293a1 1 0 111.414 1.414L9.414 8l6.293 6.293a1 1 0 01-1.414 1.414L8 9.414l-6.293 6.293a1 1 0 01-1.414-1.414L6.586 8 .293 1.707a1 1 0 010-1.414z%22 fill%3D%22currentColor%22 %2F%3E%3C%2Fsvg%3E');
  -webkit-mask-image: url('data:image/svg+xml,%3Csvg xmlns%3D%22http%3A%2F%2Fwww.w3.org%2F2000%2Fsvg%22 viewBox%3D%220 0 16 16%22%3E%3Cpath d%3D%22M.293.293a1 1 0 011.414 0L8 6.586 14.293.293a1 1 0 111.414 1.414L9.414 8l6.293 6.293a1 1 0 01-1.414 1.414L8 9.414l-6.293 6.293a1 1 0 01-1.414-1.414L6.586 8 .293 1.707a1 1 0 010-1.414z%22 fill%3D%22currentColor%22 %2F%3E%3C%2Fsvg%3E');
}

.c-notifications__item__close:hover {
  opacity: 1;
}