@import url('https://fonts.googleapis.com/css?family=Oswald:600');

* {
    box-sizing: border-box;
}

body {
    margin: 0;
}

.greeting_card {
    width: 300px;
    height: 450px;
    background-color: #111426;
    color: white;
    position: relative;
    margin: 150px auto;
    box-shadow: 4px 7px 18px -2px rgba(0, 0, 0, 0.75);
}

.greeting_card .front {
    height: 100%;
    width: 100%;
    position: absolute;
    background-color: #111426;
    transition: all 1s ease-in-out;
    transform-origin: center left;
    transform: perspective(700px) rotateY(0);
    z-index: 2;
    border: 10px solid black;
    display: flex;
    align-items: center;
    justify-content: center;
    text-align: center;
    transform-style: preserve-3d;
}

.greeting_card .front .textWrapper {
    font-family: 'Oswald', sans-serif;
    background-color: rgba(17, 20, 38, 0.5);
    width: 100%;
    z-index: 1;
    position: relative;
    top: -20px;
    opacity: 1;
    overflow: hidden;
    transition: all 0.5s;
    transition-timing-function: cubic-bezier(0, 0.15, 1,-2.7);
}

.greeting_card .front .textWrapper h1 {
    font-size: 80px;
    margin: 0;
}

.greeting_card .front .textWrapper h2 {
    font-size: 20px;
    margin: 0;
}

.greeting_card .front .firework {
    width: 150px;
    height: 150px;
    position: absolute;
    border: 5px dotted #FF0000;
    border-radius: 100%;
    top: 40px;
    left: 20px;
    display: flex;
    align-items: center;
    justify-content: center;
    animation: firework 1.5s ease-in-out infinite;
    transition-timing-function: cubic-bezier(0, 0.15, 1,-2.7);
}

.greeting_card:hover .front {
    transform: perspective(700px) rotateY(-160deg);
}

.greeting_card:hover .front .textWrapper {
    opacity: 0;
    transition: all 0.6s ease-in-out;
}

.greeting_card:hover .back {
    transform: perspective(700px) rotateY(-160deg);
    box-shadow: 5px 0px 20px rgba(0, 0, 0, 1);
}

@keyframes firework {
    from {
        transform: scale(0);
        opacity: 1;
    }
    to {
        transform: scale(1);
        opacity: 0;
    }
}