body {
    background-color: white;
    padding:0px;
    margin:0px;
}

 .center { 
     display: flex;
     align-items: center;
     justify-content: center;
     flex-direction: column; 
     width: 100%;
     height: 100%; 
     text-align: center; 
     margin: auto;
     min-height: 200px; 
     background-color: rgba(33, 33, 33, .3); 
     align-items: center; 
}