.loader {
    position: fixed;
    left: 0px;
    top: 0px;
    right: 0px;
    bottom: 0px;
    width: 100%;
    height: 100%;
    display: none;
}

.loader-bg {
    position: absolute;
    left: 0px;
    top: 0px;
    right: 0px;
    bottom: 0px;
    width: 100%;
    height: 100%;
    background-color: white;
    opacity: 0.8;
}

.loader-img {
    text-align: center;
    position: absolute;
    margin: auto;
    top: 0;
    right: 0;
    bottom: 0;
    left: 0;
    image-orientation: from-image;
}

.message {
    width: 100px;
    height: 100px;
    background-color: red;
    animation-name: example;
    animation-duration: 4s;
}

@keyframes example {
    0% {
        background-color: red;
    }

    10% {
        background-color: black;
    }

    20% {
        background-color: red;
    }

    30% {
        background-color: black;
    }

    40% {
        background-color: red;
    }

    50% {
        background-color: black;
    }

    60% {
        background-color: red;
    }

    70% {
        background-color: black;
    }

    80% {
        background-color: red;
    }

    90% {
        background-color: black;
    }

    100% {
        background-color: black;
        display: none;
    }
}