* {
    padding: 0;
    margin: 0;
}
body{
    text-align: center;
}
h1{
    margin: 2rem;
}
table{
    margin: auto;
}
h3{margin: 1rem;}
.btn {
    width: 5rem;
    height: 5rem;
    border: 1px solid black;
    border-radius: 5px;
    text-align: center;
    font-size: 3rem;
    font-weight: bold;
}
.retry-btn{
    display: none;
    cursor: pointer;
    padding: 5px;
    border: 1px solid black;
    border-radius: 5px;
    margin: 1rem;
}