simple-images-upload/sass/toast.scss

#toastr {
    visibility: hidden;
    min-width: 250px;
    max-width: 360px;
    position: fixed;
    z-index: 66;
    right: 30px;
    top: 30px;
    font-size: 17px;

    padding: 1.25rem 2.5rem 1.25rem 1.5rem;
    border-radius: 6px;

    &.error {
        background-color: $danger-color;
        color: $button-alternate-color;
    }

    &.success {
        background-color: $success-color;
        color: $button-font-color;
    }

    &.show {
        visibility: visible;
        animation: toastrFadein 0.5s, toastrFadeout 0.5s 2.5s;
    }

    button {
        width: 20px;
        font-size: 0;
        height: 20px;
        max-height: 20px;
        max-width: 20px;
        min-height: 20px;
        min-width: 20px;
        outline: 0;
        border: none;
        border-radius: 9999px;
        cursor: pointer;
        pointer-events: auto;
        display: inline-block;
        user-select: none;
        right: .5rem;
        position: absolute;
        top: .5rem;
        background-color: rgba(10, 10, 10, 0.2);

        &:hover {
            background-color: rgba(10,10,10,.3);
        }

        &::before,
        &::after {
            background-color: var(--default-color);
            content: "";
            display: block;
            left: 50%;
            position: absolute;
            top: 50%;
            transform: translateX(-50%) translateY(-50%) rotate(45deg);
            transform-origin: center center;
        }
        &::before {
            height: 2px;
            width: 50%;
        }
        &::after {
            height: 50%;
            width: 2px;
        }
    }
}

@keyframes toastrFadein {
    from {
        top: 0;
        opacity: 0;
    }
    to {
        top: 30px;
        opacity: 1;
    }
}

@keyframes toastrFadeout {
    from {
        top: 30px;
        opacity: 1;
    }
    to {
        top: 0;
        opacity: 0;
    }
}