body {
    margin: 0;
    padding: 0;
    width: 100%;
    height: 100%;
    overflow-y: hidden;
}

.centered{
    display: flex;
    align-items: center;
    justify-content: center;
}

.fixed-bottom {
    position: fixed;
    bottom: 15px;
    width: 100%;
}
.fixed-top {
    position: fixed;
    top: 10px;
    width: 100%;
}