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HTML

              
                - var banners = [{ icon: 'alert-circle-outline', class: 'error', message: 'Oops! Something went wrong!' }, {icon: 'checkmark-circle-outline', class:'success', message: 'Everything was fine!'},{icon: 'info-outline', class:'info', message: 'Here is some useful information'}];

.banners-container
  .banners
    each banner in banners
      .banner(class=banner.class)
        .banner-icon
          i(
            data-eva=banner.icon,
            data-eva-fill="#ffffff",
            data-eva-height="48",
            data-eva-width="48"
          )
        .banner-message= banner.message
        .banner-close(onclick="hideBanners()")
          i(data-eva="close-outline", data-eva-fill="#ffffff")

button.show-banner(onclick="showBanner('.banner.error')") Show Error
button.show-banner(onclick="showBanner('.banner.success')") Show Success
button.show-banner(onclick="showBanner('.banner.info')") Show Info

script(src="https://unpkg.com/eva-icons", onload="eva.replace()")

              
            
!

CSS

              
                @import url("https://fonts.googleapis.com/css?family=Montserrat:400,400i,700");

$overshoot: 10%;
$color-error: #ed1c24;
$color-success: #10c15c;
$color-info: #0b22e2;

:root {
  font-family: "Montserrat";
}

html,
body {
  margin: 0;
  height: 100%;
}

body {
  display: flex;
  align-items: center;
  justify-content: center;
}

i {
  color: inherit;
}

.banners-container {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
}

.banner {
  color: white;
  font-weight: 700;
  padding: 2rem;
  display: flex;
  flex-direction: row;
  align-items: center;

  .banner-message {
    flex: 1;
    padding: 0 2rem;
  }

  .banner-close {
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 0.5rem;
    border-radius: 4px;
    cursor: pointer;
    transition: background 0.3s;

    &:hover {
      background: rgba(0, 0, 0, 0.12);
    }
  }
}

@mixin banner($background) {
  background: $background;
  &::after {
    background: $background;
  }
}

.banner {
  &.success {
    @include banner($color-success);
  }
  &.error {
    @include banner($color-error);
  }
  &.info {
    @include banner($color-info);
  }
}

.banner::after {
  content: "";
  position: absolute;
  height: $overshoot;
  width: 100%;
  bottom: 100%;
  left: 0;
}

.banner:not(.visible) {
  display: none;
  transform: translateY(-100%);
}

.banner.visible {
  box-shadow: 0 2px 2px 2px rgba(0, 0, 0, 0.12);
  animation-name: banner-in;
  animation-direction: forwards;
  animation-duration: 0.6s;
  animation-timing-function: ease-in-out;
  animation-fill-mode: forwards;
  animation-iteration-count: 1;
}

@keyframes banner-in {
  0% {
    transform: translateY(-100%);
  }

  50% {
    transform: translateY($overshoot);
  }

  100% {
    transform: translateY(0);
  }
}

.show-banner {
  appearance: none;
  background: #ededed;
  border: 0;
  padding: 1rem 2rem;
  border-radius: 4px;
  cursor: pointer;
  text-transform: uppercase;
  margin: 0.25rem;
}

              
            
!

JS

              
                // Pssst, I've created a github package - https://github.com/brookesb91/dismissible

const showBanner = (selector) => {
  hideBanners();
  // Ensure animation plays even if the same alert type is triggered.
  requestAnimationFrame(() => {
    const banner = document.querySelector(selector);
    banner.classList.add("visible");
  });
};

const hideBanners = (e) => {
  document
    .querySelectorAll(".banner.visible")
    .forEach((b) => b.classList.remove("visible"));
};

              
            
!
999px

Console