header{
    font-weight: bolder;
   font-size: xx-large;
    padding-bottom: 3%;
}

body {
    text-align: center;
     position: absolute;
     top: 50%;
     left: 50%;
     transform: translate(-50%, -50%);
     border: 1px solid black;
    border-radius: 30px;
    padding: 10px;
}