body {
    text-align: center;
    margin: 0;
    padding: 0;
    background: radial-gradient(rgba(181, 248, 168, 0.5), rgba(34, 140, 52, 0.5))
}

main {
    display: flex;
    align-items: center;
    background: url("../img/bg13.png") repeat;
    height: 100vh;
    width: 100vw;
    justify-content: center;
}