body {
    background-image: url("banner.jpg");
    background-size: cover;
    background-position-x: center;
    background-attachment: fixed;

    margin: 0;
    padding: 0;
    height: 100vh;

    /* centrer verticalement */
    display: flex;
    justify-content: center;
    align-items: center;
}

p {
    opacity: 0%;
    animation-fill-mode: forwards;
    animation-delay: 2s;
    animation-duration: 1s;
    animation-name: fadeText;

    position: relative;
    z-index: 3; /* derniere couche */

    font-size: 1.2rem;
    font-style: italic;
}

h1 {
    opacity: 0%;
    animation-fill-mode: forwards;
    animation-delay: 1s;
    animation-duration: 1s;
    animation-name: fadeText;

    position: relative;
    z-index: 3; /* derniere couche */

    font-size: 3rem;
}

#container {
    color: white;
    text-align: center;

    position: relative;
    height: 240px;
    width: 100vw;

    font-family: "Quicksand", sans-serif;

    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;

    overflow: hidden;
}

#container::before {
    content: "";
    position: absolute;
    inset: 0;
    backdrop-filter: blur(25px);

    background: rgba(67, 55, 74, 0.1); /* 1ere couche du blend */
    z-index: 1;
}

#container .blend {
    position: absolute;
    inset: 0;
    background: rgba(67, 55, 74, 0.4); /* 2e couche du blend */
    mix-blend-mode: overlay;
    z-index: 2;

    animation-duration: 1s;
    animation-name: fadeText;
}

=================================================================================================

@keyframes fadein {

    0% {
        opacity: 0%;
    }

    100% {
        opacity: 100%;
    }
}

@keyframes fadeText {

    0% {
        opacity: 0%;
    }
    100% {
        opacity: 100%;
    }
}