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

.envelop{
position: relative;
cursor: pointer;

}
.back{
    position: relative;
    width: 250px;
    height: 200px;
    background:#6247aa;
}

.front{
    position:absolute;
    border-right: 130px solid #815ac0;
    border-top: 100px solid transparent;
    border-bottom: 100px solid transparent;
    height: 0;
    width: 0;
    top: 0;
    left: 120px;
    z-index: 4;

}
.front:before {
    content: "";
    position: absolute;
    border-left: 130px solid #815ac0;
    border-top: 100px solid transparent;
    border-bottom: 100px solid transparent;
    height: 0;
    width: 0;
    top: -100px ;
    left: -120px;
}
.front:after{
    content: '';
    position: absolute;
    border-bottom: 105px solid #7251b5;
    border-left: 125px solid transparent;
    border-right: 125px solid transparent;
    height: 0;
    width: 0;
    top: -5px;
    left: -120px;

}
.top{
    position: absolute;
    border-top: 105px solid #9163cb;
    border-left: 125px solid transparent;
    border-right: 125px solid transparent;
    height: 0;
    width: 0;
    top: 0;
    transform-origin: top;
    transition: 0.4s;
 
}
.envelop:hover .top{
    transform: rotateX(160deg);
}
.letter{
    position: absolute;
    background: white;
    width:230px;
    height: 180px;
    top: 10px;
    left: 10px;
    transition: 0.2s;
}
.envelop:hover .letter{
    transform: translateY(-100px);
    z-index: 2;
}
.text1{
    position: absolute;
    color: white;
    font-family: sans-serif;
    top: -80%;
}
.text{
    text-align: center;
    font-size: 11px;
    font-family: Arial, Helvetica, sans-serif;
    margin-top: 20px;
    font-weight: bold;
    color: black;
    position: relative;
    top: -20px;
    left: 20px;
}

.heart{
    background-color: red;
    height: 70px;
    width: 70px;
    position: relative;
    top: 20px;
    left: 20px;
    transform: rotate(-45deg);
    box-shadow: -5px 10px 90px red;
    animation: untoldcoding 0.8s linear infinite;
}

@keyframes untoldcoding {
    0%{
        transform: rotate(-45deg) scale(1.05);
    }
    70%{
        transform: rotate(-45deg) scale(1.0);
    }
    100%{
        transform: rotate(-45deg) scale(0.8);
    }
}

.heart::before{
    content: '';
    position: absolute;
    height: 70px;
    width: 70px;
    background-color:red ;
    top: -40px;
    border-radius: 50px;
}
.heart:after{
    content: '';
    position: absolute;
    height: 70px;
    width: 70px;
    background-color:red ;
    right: -40px;
    border-radius: 50px;
}