body {
    height: 100vh;
    display: flex;
    justify-content: center;
    align-items: center;
    background: #222;
}

.card {
    height: 480px;
    width: 720px;
    position: relative;
    transition: all 0.5s linear;
    transform-style: preserve-3d;
    z-index: 10;
}

.front, .back {
    height: 100%;
    width: 100%;
    border-radius: 10px;
    position: absolute;
    display: flex;
    flex-direction: column;
    justify-content: space-evenly;
}

.front {
    background-repeat: no-repeat;
    background-position: center center;
    background-size: cover;
    z-index: 3;
    backface-visibility: hidden;
    justify-content: center;
    align-items: center;
    font-size: 3em;
    font-family: "Lobster 1.3", cursive;
}

.back {
    z-index: 2;
    transform: rotateY(180deg);
    text-align: center;
}

.container:hover .card {
    transform: rotateY(180deg);
}

.container {
    perspective: 1000px;
    z-index: 10;
}

.fireworks-container {
    position: absolute;
    left: 0;
    top: 0;
    width: 100%;
    height: 100%;
    z-index: 1;
}

.texte {
    font-weight: normal;
}

.signature a {

}