toast.css

* {
    margin: 0;
    padding: 0;
    font-family: 'Poppins', sans-serif;
    box-sizing: border-box;
}

body {
    background: url(/Images/bg.jpg) no-repeat;
    background-size: cover;
    background-position: center;
}

.container {
    width: 457px;
    background: white;
    background: linear-gradient(to right bottom, rgba(255, 255, 255, 0.4), rgba(255, 255, 255, 0.2));
    color: #333;
    padding: 100px;
    border-radius: 10px;
    margin: 126px 130px;
    box-shadow: 0 0 1rem rgba(0, 0, 0, 0.2);
    text-align: center;
}

.container h1 {
    position: absolute;
    left: 12.5%;
    top: 28%;
    font-family: "Josefin Sans", sans-serif;
    font-optical-sizing: auto;
    font-weight: 700;
    font-style: normal;
    border-bottom: 4px solid black;
}

.buttons {
    position: absolute;
    margin: 50px;
    top: 30%;
    left: 8%;
}

.buttons button {
    background-color: #333;
    color: white;
    outline: none;
    border: none;
    cursor: pointer;
    width: 120px;
    height: 40px;
    margin: 5px;
}

.buttons button:hover{
    background-color: #221f1f;
}

#toastBox {
    position: absolute;
    bottom: 30px;
    right: 30px;
    display: flex;
    flex-direction: column;
    overflow: hidden;
    padding: 20px;
}

.toast {
    width: 400px;
    height: 80px;
    background: white;
    font-weight: 500;
    margin: 15px 0;
    box-shadow: 0 0 20px rgba(0, 0, 0, 0.3);
    display: flex;
    align-items: center;
    position: relative;
    transform: translateX(100%);
    animation: moveleft 0.5s linear forwards;
}

@keyframes moveleft {
    100% {
        transform: translateX(0);
    }
}

.toast i {
    margin: 0 20px;
    font-size: 35px;
    color: green;
}

.toast.error i {
    color: red;
}

.toast.invalid i {
    color: orange;
}

.toast::after {
    content: "";
    position: absolute;
    left: 0;
    bottom: 0;
    width: 100%;
    height: 5px;
    background-color: green;
    animation: anim 5s linear forwards;
}

@keyframes anim {
    100% {
        width: 0;
    }
}

.toast.error::after {
    background: red;
}

.toast.invalid::after {
    background: orange;
}