index.css

*{
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family:'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
}
.container{
    width: 100%;
    height: 100vh;
    background-color: #29442b;
    display: flex;
    align-items: center;
    justify-content: center;
}
.btn{
    padding: 10px 60px;
    background-color: #6fd649;
    border: 0;
    outline: none;
    cursor: pointer;
    font-size: 22px;
    font-weight: 500;
    border-radius: 5px;
    box-shadow: 0 5px 5px rgba(0, 0, 0, 0.2);
}
.popup{
    width: 400px;
    background-color: #7a8b7b;
    border-radius: 6px;
    position: absolute;
    top: 0;
    left: 50%;
    transform: translate(-50%,-50%) scale(0.1);
    text-align: center;
    padding: 15px 15px 30px 30px;
    color: #0b0a04;
    visibility: hidden;
    transition: transform 0.4s,top 0.4s;


}
.open-popup{
    top: 50%;
    visibility: visible;
    transform: translate(-50%, -50%) scale(1);
}
.popup img{
    width: 95px;
    margin-top: -50px;
    border-radius: 50%;
    box-shadow: 0 5px 5px rgba(0, 0, 0, 0.2);
}
.popup h2{
    font-size: 30px;
   font-weight: 500;
   margin: 30px 0 10px;

}
.popup p{
    font-size: 20px;
    font-weight: 470;
}
.popup button{
    width: 100%;
    margin-top: 50px;
    padding: 10px 0;
    background: #6fd649 ;
    border: 0;
    font-weight: 500;
    font-size: larger;
    outline: none;
    border-radius: 5px;
    cursor: pointer;
    box-shadow: 0 5px 5px rgba(0, 0, 0, 0.2);
}