:root {
    --primary: rgb(245, 116, 168);
    --bg-color: teal;
    --bg-envelope-color: rgb(255, 255, 255);
    --envelope-tab: #2eb759;
    --envelope-cover: #2eb774;
    --shadow-color: rgba(0, 0, 0, 0.2);
    --txt-color: rgb(255, 255, 255);
    --heart-color: rgb(255, 0, 0);
}

body {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    display: flex;
    justify-content: center;
    align-items: center;
    background-color: var(--bg-color);
}

.container {
    width: 100vw;
    height: 100vh;
    display: grid;
    place-items: center;
    overflow: hidden;
}

.en_wrap {
    background-color: var(--bg-envelope-color);
    box-shadow: 0 0 40px var(--shadow-color);
}

.envelope {
    position: relative;
    width: 300px;
    height: 230px;
    cursor: pointer;
}

.envelope:before {
    content: "";
    position: absolute;
    top: 0;
    z-index: 2;
    border-top: 130px solid var(--envelope-tab);
    border-right: 150px solid transparent;
    border-left: 150px solid transparent;
    transform-origin: top;
    transition: all 0.5s ease-in-out 0.7s;
}

.envelope:after {
    content: "";
    position: absolute;
    z-index: 2;
    width: 0;
    height: 0;
    border-top: 130px solid transparent;
    border-right: 150px solid var(--envelope-cover);
    border-left: 150px solid var(--envelope-cover);
    border-bottom: 100px solid var(--envelope-cover);
}

.letter {
    position: absolute;
    right: 20%;
    bottom: 0;
    width: 54%;
    height: 80%;
    background-color: var(--primary);
    text-align: center;
    transition: all 1s ease-in-out;
    box-shadow: 0 0 5px var(--shadow-color);
    padding: 20px 10px;
    border-radius: 5px;
    border: 1px solid var(--shadow-color);
}

.bg_img {
    background-position: center;
    background-repeat: no-repeat;
    background-size: cover;
    background-image: url("img/bg_img.png");
    width: 400px;
    height: 400px;
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%) scale(0.5);
    transition: transform 0.5s ease-in-out 1s;
    z-index: -1;
}

.en_wrap.active .bg_img {
    transform: translate(-50%, -50%) scale(2);
    transition: transform 1s ease-in-out 2s;
}

.text {
    font-family: "Allura";
    color: var(--txt-color);
    text-align: center;
    font-size: 18px;
    font-weight: 400;
}

.text p {
    font-family: 'Gill Sans', 'Gill Sans MT',
        Calibri, 'Trebuchet MS', sans-serif;
    font-size: 10px;
    font-weight: normal;
}

.img {
    background-position: center;
    background-repeat: no-repeat;
    background-size: cover;
    background-image: url("img/img_1.png");
    height: 120px;
    border-radius: 15px;
}

.heart {
    position: absolute;
    top: 50%;
    left: 50%;
    width: 30px;
    height: 30px;
    background: var(--heart-color);
    z-index: 4;
    transform: translate(-50%, -20%) rotate(45deg);
    transition: transform 0.5s ease-in-out 1s;
    box-shadow: 0 4px 9px var(--shadow-color);
    cursor: pointer;
}

.heart:before,
.heart:after {
    content: "";
    position: absolute;
    width: 30px;
    height: 30px;
    border-radius: 50%;
    background-color: var(--heart-color);
}

.heart:before {
    top: -15.5px;
}

.heart:after {
    right: 15.5px;
}

.en_wrap.active .envelope:before {
    transform: rotateX(180deg);
    z-index: 0;
}

.en_wrap.active .letter {
    bottom: 100px;
    transform: scale(1.5);
    transition-delay: 1s;
}

.en_wrap.active .heart {
    transform: rotate(90deg);
    transition-delay: 0.4s;
}