body {
    height: 100vh;
    overflow: hidden;
    font-family: Arial, Helvetica, sans-serif;
    background: black;
}

::selection {
    background-color: grey;
}

.FlexCenter {
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
}
.FlexCenter2 {
    display: flex;
    justify-content: center;
    align-items: center;
}