.popper {
    width: 50px;
    height: 50px;
    border-radius: 50%;
    margin: 0.25%;
    border: 1px solid red;
    background-image: linear-gradient(rgba(245, 246, 252, 0.25), rgba(117, 19, 93, 0.25), rgba(0, 0, 0, 0)), radial-gradient(circle, red 0%, red, black 100%);
    transition: background-image;
    transition-duration: 0.5s;
}
#main {
    margin: auto;
    width: 100%;
    text-align: center;
}
#reset {
    background: darkblue;
    font-family: cursive;
    color: white;
    border-radius: 25px;
    width: 200px;
    height: 50px;
    font-size: 20px;

}
body {
    background: lightblue;
}