* {
    box-sizing: border-box;
}
body {

    margin:0;
    display: flex;
    flex-direction:column;
    align-items: center;
    justify-content:center;
    min-height: 100vh;
    min-width: 100vw;

    font-size: 32px;
}

button {
    width: 400px;
    height: 60px;
    font-size: 16px;
}