.content{
    position: relative;
     *{
        background-color: yellow;
    }
}

.content-text{
    position: relative;
    background-color: yellow;

    h1,h2,.descriptif p, p, span,.author a{
        background-color: yellow;
    }
}

.content-text::before,
.content-text::after{
    content: '';
    display: block;
    position: absolute;
    top: 0;
    z-index: 1000;
    width: 100%;
    max-width: 300px;
    height: 100%;
    max-height: 300px;
    background: url('../img/radioactivite.svg') no-repeat center center;
    mix-blend-mode: multiply;
    animation: kraftwerk 1s infinite;
    animation-timing-function: ease-in-out;
    animation-delay: 1s;
    animation-fill-mode: both;
    animation-direction: alternate;
    animation-iteration-count: infinite;
    animation-play-state: running;
    animation-duration: 1s;
}

.content-text::before{
    left: 0;
}

.content-text::after{
    right: 0;
}

@keyframes kraftwerk {
    0% {
        opacity: 0;
        filter: blur(10px);
    }
    100% {
        opacity: 1;
        filter: blur(0px);
    }
}