.container {
    text-align: center;
}

#registration-btn {
    color: white;
    background: #4472C4;
    text-align: center;
    opacity: 90%;
    margin-left: auto;
    margin-right: auto;
    border: 2px solid grey;
    padding: 0.8rem 0.5rem 0.5rem;
    border-radius: calc(0.25rem - 1px) calc(0.25rem - 1px) calc(0.25rem - 1px) calc(0.25rem - 1px);
}

.card{
    margin-right: 20%;
    margin-left: 20%;
}