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HTML 

              
                <div class="px-app px-continer">
  <div class="px-gridbox">
    <div class="px-griditem item-success" onclick="ntf('This is a Success Notification')">
      <svg xmlns="http://www.w3.org/2000/svg" class="notification-icon" viewBox="0 0 512 512"><title>Checkmark</title><path fill="none" stroke="currentColor" stroke-linecap="round" stroke-linejoin="round" stroke-width="32" d="M416 128L192 384l-96-96"/></svg><span>Success</span>
    </div>
    <div class="px-griditem item-warning" onclick="ntf('This is a Warning Notification','warning')">
      <svg xmlns="http://www.w3.org/2000/svg" class="notification-icon" viewBox="0 0 512 512"><title>Warning</title><path d="M85.57 446.25h340.86a32 32 0 0028.17-47.17L284.18 82.58c-12.09-22.44-44.27-22.44-56.36 0L57.4 399.08a32 32 0 0028.17 47.17z" fill="none" stroke="currentColor" stroke-linecap="round" stroke-linejoin="round" stroke-width="32"/><path d="M250.26 195.39l5.74 122 5.73-121.95a5.74 5.74 0 00-5.79-6h0a5.74 5.74 0 00-5.68 5.95z" fill="none" stroke="currentColor" stroke-linecap="round" stroke-linejoin="round" stroke-width="32"/><path style="fill:#f7d78b" d="M256 397.25a20 20 0 1120-20 20 20 0 01-20 20z"/></svg><span> Warning</span>
    </div>
       <div class="px-griditem item-error" onclick="ntf('This is an Error Notification','error')">
      <svg xmlns="http://www.w3.org/2000/svg" class="notification-icon" viewBox="0 0 512 512"><title>Close Circle</title><path d="M448 256c0-106-86-192-192-192S64 150 64 256s86 192 192 192 192-86 192-192z" fill="none" stroke="currentColor" stroke-miterlimit="10" stroke-width="32"/><path fill="none" stroke="currentColor" stroke-linecap="round" stroke-linejoin="round" stroke-width="32" d="M320 320L192 192M192 320l128-128"/></svg>
      <span>Eroor</span>
    </div>
    </div>
</div>
!

CSS 

              
                :root {
  --px-color-bodybg: rgb(19, 26, 41);
  --px-color-boxbg: rgb(12, 16, 29);
  --px-color-boxborder: rgb(27, 34, 55);
  --px-border-radius: 6px;
}

html {
  font-size: 16px;
  font-family:arial;
}
body {
  font-size: 1rem;
  width: 100%;
  min-height: 100vh;
  margin: 0;
  padding: 0;
  background-color: var(--px-color-bodybg);
  display: flex;
  flex-direction: column;
  flex-wrap: wrap;
  align-items: center;
  justify-content: center;
}

.px-app,
.px-app *,
.px-app *::before,
.px-app *::after {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
  outline: 0;
}
.px-continer {
  width: 100%;
  max-width: 600px;
  padding: 4rem 0;
}
.px-gridbox {
  padding-bottom: 3rem;
  display: grid;
  gap: 1rem;
  grid-template-columns: repeat(3, 1fr);
}
.px-griditem {
  font-size: 1rem;
  min-height: 6rem;
  border: 2px solid var(--px-color-boxborder);
  border-radius: var(--px-border-radius);
  background-color: var(--px-color-boxbg);
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  cursor:pointer;
}

.px-griditem svg {
  width: 90px;
  padding: 10px;
  color: #b3b3b3;
}
.px-griditem span {
  display: block;
  width: 100%;
  background: #fff;
  text-align: center;
  border-radius: 0 0 4px 4px;
  padding: 5px;
}


.px-griditem.item-success {
  border-color: #a9eea7;
}
.px-griditem.item-success span {
  background: #a9eea7;
}
.px-griditem.item-success svg {
  color: #a9eea7;
}
.px-griditem.item-warning {
  border-color: #f7d78b;
}
.px-griditem.item-warning span {
  background: #f7d78b;
}
.px-griditem.item-warning svg {
  color: #f7d78b;
}
.px-griditem.item-error {
  border-color: #fb6565;
}
.px-griditem.item-error span {
  background: #fb6565;
}
.px-griditem.item-error svg {
  color: #fb6565;
}

/*End Demo*/
.notifications {
    position: absolute;
    left: 0;
    bottom: 0;
    z-index: 9999;
    padding: 15px;
}

.notification {
	display: flex;
	padding: 5px 10px;
	justify-content: space-between;
	background: rgba(255, 255, 255, 0.5);
	border: 1px solid;
	border-radius: 3px;
	margin: 5px 0;
	-webkit-animation: anm_slide_right 0.2s ease-in-out normal;
	animation: anm_slide_right 0.2s ease-in-out normal;
	align-items: center;
	padding-right: 32px;
	position: relative;
	-webkit-backdrop-filter: blur(2px);
	backdrop-filter: blur(2px);
}

.notification-icon {
    padding-right: 10px;
    box-sizing: border-box;
    width: 35px;
}

.message {
    display: block;
    flex-basis: 100%;
    flex-grow: 1;
}

.notification .close {
    padding: 0 7px;
    margin-left: 25px;
    cursor: pointer;
    position: absolute;
    right: 5px;
    top: 43%;
    line-height: 0;
    transform: translate(0, 0);
}

.notification.success {
	color: #006005;
	background: rgba(255, 255, 255, 0.78);
	border-color: rgba(0,255,0,.4);
}

.notification.alert {
    border-color: #b7b700;
    color: #000;
    background: #f0efa6;
}

.notification.warning {
    color: yellow;
}

.notification.error {
	color: red;
	border-color: rgba(236, 96, 96, 0.4);
}



@keyframes anm_slide_right {
    from {
        transform: translate(-110%, 0);
        opacity: 0;
    }

    to {
        transform: translate(0, 0);
        opacity: 1;
    }
}
!

JS 

              
                class Notification {
    constructor({ ...options }) {
        this.type = options.type || "success";
        this.message = options.message || "";
        this.timeout = options.timeout || 6000;
        //if not success then error and timeout should increse
        if (this.type !== "success") {
            this.timeout = this.timeout * 2;
        }
        this.bind();
    }
    build() {
        //element
        let singleElement = document.createElement("div");
        singleElement.classList.add("notification");
        singleElement.classList.add(this.type);
        if (this.type == 'alert' || this.type == 'warning') {
            singleElement.innerHTML = '<svg xmlns="http://www.w3.org/2000/svg" class="notification-icon" viewBox="0 0 512 512"><title>Warning</title><path d="M85.57 446.25h340.86a32 32 0 0028.17-47.17L284.18 82.58c-12.09-22.44-44.27-22.44-56.36 0L57.4 399.08a32 32 0 0028.17 47.17z" fill="none" stroke="currentColor" stroke-linecap="round" stroke-linejoin="round" stroke-width="32"/><path d="M250.26 195.39l5.74 122 5.73-121.95a5.74 5.74 0 00-5.79-6h0a5.74 5.74 0 00-5.68 5.95z" fill="none" stroke="currentColor" stroke-linecap="round" stroke-linejoin="round" stroke-width="32"/><path d="M256 397.25a20 20 0 1120-20 20 20 0 01-20 20z"/></svg>';
        } else if (this.type == 'success') {
            singleElement.innerHTML = '<svg xmlns="http://www.w3.org/2000/svg" class="notification-icon" viewBox="0 0 512 512"><title>Checkmark</title><path fill="none" stroke="currentColor" stroke-linecap="round" stroke-linejoin="round" stroke-width="32" d="M416 128L192 384l-96-96"/></svg>';
        } else {
            singleElement.innerHTML = '<svg xmlns="http://www.w3.org/2000/svg" class="notification-icon" viewBox="0 0 512 512"><title>Close Circle</title><path d="M448 256c0-106-86-192-192-192S64 150 64 256s86 192 192 192 192-86 192-192z" fill="none" stroke="currentColor" stroke-miterlimit="10" stroke-width="32"/><path fill="none" stroke="currentColor" stroke-linecap="round" stroke-linejoin="round" stroke-width="32" d="M320 320L192 192M192 320l128-128"/></svg>';
        }
        //message
        let messageElement = document.createElement("div");
        messageElement.classList.add("message");
        messageElement.innerHTML = this.message;
        singleElement.appendChild(messageElement);
        //close
        let closeElement = document.createElement("div");
        closeElement.classList.add("close");
        closeElement.innerHTML = "&times;";
        closeElement.addEventListener("click", () => {
            singleElement.remove();
        });
        singleElement.appendChild(closeElement);
        singleElement.classList.add('slide-righr');
        return singleElement;
    }

    bind() {
        //check existance of notifications wraper
        let notificationsWrapper = document.querySelector(".notifications");
        if (!notificationsWrapper) {
            notificationsWrapper = document.createElement("div");
            notificationsWrapper.classList.add("notifications");
            document.body.appendChild(notificationsWrapper);
        }
        //append notification
        notificationsWrapper.appendChild(this.build());
        //remove notification after timeout
        setTimeout(() => {
            if (notificationsWrapper.firstChild) {
                notificationsWrapper.removeChild(notificationsWrapper.firstChild);
            }
        }, this.timeout);
    }
}

window.ntf = function (txt, cls) {
    new Notification({
        message: txt,
        type: cls
    });
};
!
999px

Console