html, body, .container {
     height: 100%;
     background-color: white;
     color: black;
}

.container {
     display: flex;
     align-items: center;
     justify-content: center;
     background-color: white;
     color: black;
}

.child {
     display: flex;
     align-items: center;
     justify-content: center;
     background-color: White;
     color: black;
     text-align: center;
}