.page-flexbox-wrapper {

    display: flex;
    min-height: 100vh;
    flex-direction: column;

}


main {
    flex: 1 1 auto;
}


button:focus {
   color:black;
    box-shadow: 0 16px 24px 2px rgba(0, 0, 0, 0.14), 0 6px 30px 5px rgba(0, 0, 0, 0.12), 0 8px 10px -5px rgba(0, 0, 0, 0.3);
}