style2.css

*,
*:before,
*:after{
    padding: 0;
    margin: 0;
    box-sizing: border-box;
}
body{
    background-image: linear-gradient(rgba(27, 13, 65, 0.4), rgba(57, 59, 172, 0.4)), url(back.jpg);
    background-size: cover;
    background-position: center;
    position: relative;
    height: 100vh;

}

.popup{
    background-color: #ffffff;
    width: 420px;
    padding: 30px 40px;
    position: absolute;
    transform: translate(-50%,-50%);
    left: 50%;
    top: 50%;
    border-radius: 8px;
    font-family: "Poppins",sans-serif;
    display: none; 
    text-align: center;
}
.popup h2{
  margin-top: -20px;
}
.popup p{
    font-size: 14px;
    text-align: justify;
    margin: 20px 0;
    line-height: 25px;
}
a{
    display: block;
    width: 150px;
    position: relative;
    margin: 10px auto;
    text-align: center;
    background-color: #0f72e5;
    border-radius: 20px;
    color: #ffffff;
    text-decoration: none;
    padding: 8px 0;
}