CSS Snippets

Make an alert box that will count down & disappear

Codepen

.alert {
  background: rgba(179, 14, 14, 0.77);
  color: white;
  min-height: 50px;
  min-width: 250px;
  max-width: 350px;
  padding: 10px;
  border-radius: 6px;
  position: absolute;
  bottom: 5%;
  right: 3%;
  display: none;
  -webkit-box-shadow: 0 10px 6px -6px #777;
  -moz-box-shadow: 0 10px 6px -6px #777;
  box-shadow: 0 10px 6px -6px #777;
}

.alert::before {
  content: "";
  background: rgb(165, 26, 26);
  height: 5px;
  position: absolute;
  top: -1px;
  left: 0%;
  right: 0%;
  border-top-right-radius: 6px;
  border-top-left-radius: 6px;
  animation: countdown 5s linear 1;
}

@keyframes countdown {
  from {
    right: 0%;
    opacity: 1;
  }
  to {
    right: 100%;
    opacity: 0;
  }
}